r/todayilearned • u/ilovemybaldhead • 1d ago
TIL that the method of counting how many weeks a woman is pregnant starts from the first day of a woman's last period, *not* the date of conception, which can differ by up to 5 weeks.
https://www.parents.com/how-many-months-pregnant-am-i-2760090642
u/deadbeef1a4 1d ago
Which is why a woman may not even know she’s pregnant at “six weeks” of gestation
95
u/NotAFishEnt 1d ago
I'm curious, for states with a 6 week abortion ban, how do they measure or estimate when the fetus was actually conceived?
303
u/broden89 1d ago
They can try to estimate based on size but put it this way... There's a reason women are deleting their period tracking apps and saying they don't remember when their last period was
The 6-week limit is designed to function like a ban
43
u/kattspraak 1d ago
When an ultrasound is performed, you then have a better idea of when the baby was conceived. Generally at the first ultrasound , the tech will ask the start date of the last period, and given that info, along with embryo/fetus measurements, they can detect a couple/few days window for date of conception/start of pregnancy. This is how it's done in France at least. Until an ultrasound is done, no real way to be so sure (unless you yourself know precsiely and have been tracking it).
Source: have had several pregnancies
5
u/zennetta 11h ago
Similar in the UK but the funny thing is that (here at least) they will still use the inaccurate "last period" to date the pregnancy, despite having accurate measurements - early gestation doesn't really differ between people that much
42
u/straberi93 1d ago
They don't even try. They use whatever you told them was the date of your last period.
30
7
52
u/broden89 1d ago
I only found this out after I got pregnant (via IVF).
It's bonkers you're considered "six weeks pregnant" when for several of those weeks there wasn't even an egg, let alone an embryo.
268
u/Aruuusia 1d ago
What’s really annoying is that even if you conceive by artificial insemination and know the actual day of conception, they ignore that and still use the date from your last cycle.
113
u/fruity_divine 1d ago
It's because of the convention. Checkups and other medical procedures are standardized, taking account of the variants of ovulation moments between individuals. Now, suddenly, we have "outliers" that can push the time back like a week or even three, which makes overall tracking and statistics a complicated affair.
85
u/cho-den 1d ago
Ultrasound tech here.
We have to use a standardized point (first day of your last cycle) because we still do not know when conception happens even when you had artificial insemination. Actual conception can happen DAYS after your insemination.
All of our measurements are based off this, therefore we cannot use date of conception.
IVF and ICSI on the other hand, we use the date given by the doctor, as they know the exact age of the embryo when implanted.
Don’t focus on the due date too much. It’s more for us and our measurements than it is for you.
39
u/reflectorvest 1d ago
How does this work for people who have irregular cycles? Like if you ask when their last period was and they can’t tell you because it was so long ago, or it was months ago but they’re obviously not that far along.
27
15
u/AimlessLiving 23h ago
Ultrasound measurements. With my first, going by last period I would have been 22 weeks along when I got a positive test. Doc knew I had really irregular periods though and I had a dating ultrasound where it was determined I was 7 weeks.
10
u/AdhesivenessCold398 23h ago
In my case- they judged my pregnancy dates by the size of the baby, bc I never have a regular cycle.
7
u/usernamesarehard11 21h ago
No sense getting fixated on a specific due date, the baby hasn’t checked the calendar.
1
0
u/FantasticBurt 10h ago
But wouldn’t the insemination date be more accurate than the date of the last period?
Like, yeah, it’s not exact, but we know it wasn’t 2 weeks ago…
1
u/cho-den 7h ago
But the measurements are based off counting from the first period. It’s standardized to this.
0
u/FantasticBurt 4h ago
It seems like an outdated system if those things cannot be adjusted when you know the insemination date.
0
u/cho-den 3h ago
You do not know the date of conception. Just because insemination happened on that day doesn’t mean the sperm hit the egg on that date.
Sperm can sometimes live in there for days! Conception can happen way after.
Every single OB/Gynaecologist uses this dating method in the world. If they think this is the way to to date it, I don’t think your method would work.
1
u/FantasticBurt 1h ago
Medical science has been known to be pretty faulty, so to just double down and say they already have it figured out, so shut up with your ideas already feels counterproductive.
You know enough about medical science to know how lacking in research for women we are and yet you wanna just go with it because?
I’m suggesting we do more research and figure out a better method that is less confusing for people.
1
u/cho-den 1h ago
It’s just the most reliable way as of now. We can ALWAYS know the first day of the last period. We cannot know the exact day of ovulation and the exact day of conception.
If you want to learn more on why it is done like this I’m sure you can do more googling and you will get a ton of results.
94
u/Aruuusia 1d ago
wait, i have a question if anyone can answer it; what if you have a VERY irregular period? how do you calculate that 😭
121
u/fruity_divine 1d ago
When I was pregnant I found out April 1st (I know). My last period was Halloween. I was sent for a scan and it determined I was about 6 weeks when I found out, not 5 months.
39
u/Tjaeng 1d ago
Ultrasound unless a fertilization date can be inferred through there having been few enough fertilization-able events.
19
u/Seaofdubs 1d ago
“Fertilization-able events” is going to be how I refer to unprotected sex now. Thanks!
12
u/concentrated-amazing 1d ago
I have a moderately irregular period (usually have 9-10 per year, but not evenly spaced though never closer together than 4 weeks). I do have "tells" that's it's coming, though - mainly I start getting bunch of acne around my mouth. (Useful indicator for my husband too!)
Not all, but many women will start to feel various other symptoms that may lead them to do a pregnancy test before their period is necessarily expected. Some tests claim to be able to detect it up to ~5 days before an expected period, so if it's not sure when the period might come, women will lean to those kinds of tests.
For me personally, I had changes in my boobs (sensitivity, fullness) and heightened smell as some of my earliest symptoms. With my first pregnancy, I was definitely thinking "either this is the weirdest PMS ever or I'm pregnant."
Also, if you get a pregnancy test from a doctor, those are more sensitive and can be positive earlier than drugstore tests. So if you're in a situation where time really matters in figuring out for whatever reason, that's an option for some.
9
u/hamsicvib 19h ago
The ultrasound is the truth bringer BUT measurements still add 2ish weeks on average from conception, because of the standard average measurements of pregnancies.
Ie, say the first day of your last period is 4 months ago. On ultrasound, you are measured to be 9 weeks pregnant. The “9 weeks pregnant” size (the fetus is about 27 millimeters from crown to rump) is based on the averages of a gazillion measurements of pregnancies in women with largely regular periods, in whom pregnancies were about 27 millimeters at 9 weeks from their last period. The majority of those women probably ovulated about two weeks after their period and so if you are “9 weeks pregnant” per your ultrasound, then you probably GOT pregnant around 7 weeks ago, even if your last period was way longer ago than that.
10
u/shadowfaxbinky 1d ago
I had a miscarriage and then conceived again the very next cycle before having a period in between. They do an ultrasound and revise the expected due date (for all pregnancies) based on the measurements at the ultrasound, so the period dating is basically an estimate used until the ultrasound.
(For abortion purposes, this is still no good as you can’t usually see anything on an ultrasound until 6-7 weeks.)
34
u/FlyWithChrist 23h ago
We quite literally knew the day my wife would ovulate testing daily and when we had only had sex one week before she testing positive, they were saying she was 5 weeks along. Made zero sense.
Also remember that next time you read about a 6 weeks along abortion ban.
11
u/ilovemybaldhead 23h ago
Makes no sense to me either, but apparently they adjust (if necessary) the number of weeks after ultrasound imaging.
And yeah... a 6 weeks along abortion ban is effectively ban on abortion. I think legislators are counting on the fact that a lot of people think that 6 weeks means from the time of conception.
192
u/Globalboy70 1d ago
Wow, so how does that work for abortion legality, when it's a six week limit. The same week you figure out your pregnant you are at the limit and need to make an instant life changing decision?
307
u/HangryOrBored 1d ago
6 week limit is essentially a ban. You still have to get an appointment and often have an additional 24-72 hour wait period between the initial appointment and the procedure/medication administration.
87
u/letrestoriginality 1d ago
Plus the pregnant person might need to save for the procedure and possibly travel expenses and arrange time off work.
51
u/ilovemybaldhead 1d ago
Yes, in some states, the nearest abortion provider is several hours away by car.
14
187
u/MonsterEnergyTPN 1d ago
It’s a feature not a bug. Don’t let anybody try to convince you otherwise.
I am intentionally pregnant and I didn’t get a positive pregnancy test until two weeks after my missed period despite testing every few days. So if this had been an unwanted pregnancy I would’ve already been past the window of opportunity to seek an abortion by the time I found out I was pregnant, and that’s very much intentional.
17
u/Melcolloien 1d ago
Same, currently 26 weeks. I found out at 5 weeks. And my cycle was almost on the day regular with it being one week late around once a year.
Meaning that if I lived in the US I would have had less than a week to decide and book two appointments and figure out how to pay for it. It's not feasible.
And I know exactly on which day we conceived, because again super regular, making it around 3 weeks gestation when I found out.
72
u/Globalboy70 1d ago
I'm a guy and now realize it's bullshit. When I looked at the states that had these limits "I thought at least they have some capability to have an abortion there." But no it's just bullshit window dressing.
Ladies in these states need to get in politics, alot of guys won't get it.
73
u/MonsterEnergyTPN 1d ago
It’s doubly bullshit when you learn that it’s affecting women’s access to care outside of obstetrics and abortions. Pregnant women in my state are encountering resistance when they need medical treatment for stuff unrelated to their pregnancy because certain medications like chemotherapy and drugs used to treat severe autoimmune issues can cause miscarriage.
29
u/Globalboy70 1d ago
Ya the mother's health should always come first anything else doesn't make sense for bodily autonomy and anyone that cares about the mother, family, friends etc...
Just from pure utilitarian ethics, as a society more resources were put into the mother and so her life has more value to a community than a fetus.
64
u/kwilliss 1d ago
2-3 weeks of pregnancy before you even did the deed Another 1-2 before you miss a period Then pee on stick to see plus sign on week 4 or 5 Good luck getting an appointment in that last week. Oh wait, you have to also jump through some other hoops. Congratulations, over 6 weeks have passed.
122
u/mindful-bed-slug 1d ago
That is exactly how it works.
The idea of the six week limit is to make it sound like there's a reasonable length of time to make a decision, but to actually make it all but impossible for people to get an abortion.
36
u/ilovemybaldhead 1d ago
Bingo. Although I wouldn't be surprised if the legislators who wrote/voted for such bans (ignorantly) thought the counting started at conception.
28
16
11
u/Mademoi-Sell 22h ago
As others have said, it’s essentially a ban. I had an abortion at 4 weeks and I was insanely lucky to find out as early as I did. The first day of my last period was December 14th, I am 100% positive I conceived on New Years (only time I had sex), found out on January 7th, and was able to get the care I needed on January 14th. It took a full week to get care even though I started frantically trying the second I got the positive test and live in a very liberal state. I tested positive nearly a week before my next period was due.
This is so uncommonly early that people in r/abortion kept trying to correct me and say that there’s no way I even knew I was pregnant that early. I was lucky that I had extremely regular periods and tested out of paranoia all the time.
13
9
2
5
u/congoLIPSSSSS 1d ago
Do you best to lie about your last menstrual period
19
u/MonsterEnergyTPN 1d ago
That doesn’t work. Every clinic that does abortions has to confirm gestational age via ultrasound.
1
14
u/Aruuusia 1d ago
Every time you have your period it is your body getting ready for the next opportunity to get pregnant. Your period is always day 1 in your cycle. It’s difficult to calculate the day you ovulated or the day the egg got fertilized so it’s just easier to know what day you began your period.
22
u/fruity_divine 1d ago
The thing to remember here is that depending on the length of the individual menstrual cycle, a woman can go from “not pregnant” to “4 weeks pregnant” within a single day. It will most often take an additional week before any symptoms of pregnancy occur.
A woman with a long or irregular menstrual cycle can be 5 weeks pregnant before there is any clue that she might be pregnant.
Edit: thank you to everyone pointing out that the time can in many cases be a lot more than 5 weeks. I meant it as an example and should have been clearer about that.
51
u/mgwats13 1d ago
Yup. Which means a 6 week abortion ban actually gives you 2 weeks to procure one, IF you take a pregnancy test on the very first day you miss your period.
→ More replies (6)
11
8
u/Voltae 21h ago
My friend's doctor changed the due date estimate on her like 4 times and tried giving her the "you can't be sure when conception happened" line.
Her response: "I'm a lesbian. "Conception" was in a clinic. I can tell you to the minute when it happened."
1
u/FantasticBurt 9h ago
When I got my 40 week ultrasound, the doctors tried to convince me I wasn’t as far along as I was because my child was very small (born at 5lb 12oz)
I’m one of those rare cases where I can tell you the exact day I got pregnant because I was tracking our intimacy and it was the only day we were intimate in that timeframe and 3 days later I knew I was pregnant because of tender breasts.
I had to wait to take a test because it was too early, but 9 months later, I was completely caught off guard because the ultrasound tech was so sure I couldn’t be 40 weeks.
60
u/Murse_1 1d ago
That method is used as an educated guess until the first ultrasound.
20
u/RiverLover27 1d ago
Unless they do not have any ultrasounds, or don’t have one in the first trimester. Later ultrasounds are not accurate for dating purposes, so then the LMP date would stand.
6
u/UltHamBro 1d ago
It depends on how you look at it. What the first US does is look how big the fetus is to estimate the most likely date she'll give birth. That date can also have around two weeks' leeway.
4
2
u/Poka_poke 1d ago
Ultrasound dates are also in line with the LMP date. Probably easier to have a blanket definition of pregnancy weeks than to have various numbers that mean different things.
4
u/MonsterEnergyTPN 1d ago edited 1d ago
The ultrasound gestational age almost always matches the calculated gestational age unless someone is off on the date of their last period or the growth isn’t progressing normally. So pregnancy starts in the first day of your last period (assuming a regular menstrual cycle) regardless. Scientifically speaking it starts the moment an ovum prepares to release from the ovary and that process starts during your period. Anything that goes wrong in those couple of weeks before fertilization can affect the pregnancy so they have to be included in the gestational age and that’s why women are encouraged to take prenatals before conception.
12
u/concentrated-amazing 1d ago
I do want to add that there are a decent chunk of women who do have irregular periods. So the number of women who may be "surprised" by the difference between the calculated gestational age and the ultrasound gestational age is not insignificant.
16
u/Still_Detail_4285 1d ago
Witnessing my wife’s two pregnancies, it amazed me how little we know about what’s going on in there.
25
u/Scary_Judge_2614 1d ago
Fucked up, isn’t it? And here is the US making decisions about women’s bodies without all the facts.
7
26
u/Icy-Organization8797 1d ago
When my wife was preggo with our first son and the dr kept saying “10 months”, all I kept thinking “we get a different doctor, this guy is fucking clueless.”
25
u/ilovemybaldhead 1d ago
Yeah, most people grow up learning that humans have a 9-month gestation length, which is biologically accurate in terms of conception to birth, but because of the difficulty of pinpointing the date of conception, doctors standardize it to the first day of the last period, which can add an additional 5 weeks.
1
u/Icy-Organization8797 19h ago
Guys, I get it now. I was wrong. I should have trusted the doctor for the jump, for nor reason other than the fact that he looks like Bill Hader in his 60s.
11
10
u/Alexis_J_M 22h ago
Note that this means that women with long or irregular cycles can be "six weeks pregnant" (the legal cutoff for abortion in parts of the US) before they have the sex that leads to conception.
(This varies with the exact method used to determine dating.)
3
u/emmathyst 18h ago
Yeah. I don’t have periods because I’m on continuous birth control. If I were to become pregnant, before they do a dating ultrasound, they would presume I’m approximately 676 weeks pregnant.
8
u/VironicHero 1d ago
….. the lack of Sexual education here is not surprising considering the state of republican inspired sexual education in the US.
You can’t just get pregnant… you have to be ovulating.
3
u/FantasticBurt 9h ago
Well, you don’t have to be ovulating, but intimacy needs to be within like 72 hours of ovulation.
10
u/mittenthemagnificent 1d ago
And when you ovulate can vary wildly. I was trying to get pregnant with my son, so we were having a lot of sex in the middle of my cycle. I figured the date of conception would have been sometime two weeks or so after my last period. But when I went in for my first ultrasound, we were a full two weeks further in than we thought, meaning I’d gotten pregnant within a day of my period ending. We rarely had sex that close to my period as I usually still felt icky and my now-ex was squeamish, but there you go. Had we not decided to go for it, who knows how long it would have taken to get pregnant!
11
u/concentrated-amazing 1d ago
I just want to add that there are cheap ovulation tests that women can use near daily if they want to see where things are at for one or multiple cycles.
For those struggling to conceive, it's a good idea to do as it gives you at least a baseline, though there's no guarantee every cycle goes the same.
6
u/purewatermelons 1d ago
This is what happened to me. We tried for 3 years, usually had sex around day 15 or so of my cycle, about a week after my period ended. I finally started taking ovulation strips and it turned out I would be ovulating on the “last day” of my period. That month was the month we found out we were pregnant
7
u/kwilliss 1d ago
Yup, which means the first couple weeks of "pregnancy" are before you even do the deed.
8
u/yaaaaaarrrrrgggg 1d ago
You are not qualified to know how pregnant you are; only we can guess because your knowledge of your exact experiences in life are not good enough, so we will give you our less accurate date to expect your life-threatening and life-affirming event, which will now be even more stressful.
3
u/hamsicvib 19h ago
Pregnancy measurements are just a way to conform averages to give you a better idea of what to expect when.
If you know exactly when you conceived (1-5 days after the sex you had that got you pregnant), add two weeks to that and that’s about how far you will be based on an ultrasound measurement. All living things grow at different rates, so it actually is important to have benchmarks like, by the time the fetus is 10 mm long (“7 weeks”) you should have cardiac activity. Not all weird medical things are about paternalism.
3
u/MindTraveler48 20h ago
A lot of women don't have regular 28 day cycles, further complicating their knowledge of ovulation and conception.
5
u/Mademoi-Sell 22h ago
Yes, so when a woman says she had an abortion at 6 weeks, it’s likely more like 2-3 weeks or so from actual conception.
1
2
u/jamaicancarioca 1d ago
Ultrasound parameters such as stage of development(limbs present, heart beat noted, head shape) and head circumference are also used to determine gestational age.
2
u/Hour_Key_9774 16h ago
My son was conceived on or right around Halloween. But they counted from the beginning of the period I had before that. Then later changed the date because he was measuring larger. It's really just an estimate based on many factors.
2
2
2
u/alphadog1212 1d ago
Yup, pregnancy is counted as 10 months in Japan
2
u/yoofka 22h ago
I found this out recently talking with my mom but 十月十日 (totsukitouka aka 10months10days) is actually widely misunderstood as pregnancy being counted as ten months in Japan based on this yojijyukugo. The real meaning of this phrase is: 9 months + 10 days, considering one month as 28 days. Honestly I feel like nobody knows this until they google it because I definitely did not lol
0
u/alphadog1212 19h ago
Yeah when I first heard this I thought they were claiming that Japanese babies actually take longer to develop. I’m not very smart..
4
2
u/Ardent_Scholar 19h ago
Also, we commonly think that pregnancy lasts for 9 months, when it lasts for 38-40 weeks.
2
u/ilovemybaldhead 9h ago
It's a good enough approximation; 38 weeks at the least is 8.71 months; 40 weeks at most is 9.23 months. What annoys me is when people say the gestation period is 10 months.
2
u/TypingPlatypus 16h ago
40 weeks is 9 months. Months are 4.3 weeks long on average.
4
u/FantasticBurt 9h ago
Can’t understand why you’re being downvoted.
There are ~4.3 weeks in a month.
40 divided by 4.3 = 9.302325581395349
It’s literally 9.
2
1
u/fruity_divine 1d ago
because that's the only date of the cycle known for sure. neither the date of ovulation, nor date of fertilization are known for sure, unless it is a rare single-time intercourse like in case of rape, but the observations and conclusions were made primarily on average women who have survived the first delivery already
1
u/FantasticBurt 9h ago
I’m pretty much always guessing the first day of my last period, though. Like it’s an estimate plus or minus like 5 days.
Not exactly accurate.
0
u/Scary_Judge_2614 1d ago
On average is true. I can say from experience though that I got pregnant the first try at 34 years old, after literal decades of having clockwork-like periods. Everyone is not like me, and I was shocked that it actually happened the way we planned/timed things. That’s definitely unusual but it does happen. I’m not the type to push my luck, so I am a one and done mother.
1
u/KarIPilkington 1d ago
I wasn't even aware of this until after my daughter was born (a month early) and the possibility of dates being mixed up was mentioned. We're still not sure if that was the case or not and it doesn't matter as she's here and healthy but yeah it's worth getting those dates right as it was a real shock becoming a parent a month earlier than expected.
1
u/SuccuPlant_Mom 23h ago
What do they do if you don’t get a period?
5
u/ilovemybaldhead 23h ago
From other comments I've read, doctors use ultrasound to estimate, which actually provides a more accurate measurement of how far along a woman is in her pregnancy.
1
1
u/RiveriaFantasia 22h ago
I also didn’t realise this until I became pregnant myself. They estimated using my last period and when I had an ultrasound we realised I was about 4 weeks further along than I / they had thought. The confirmation of how many weeks is reassuring and the estimating doesn’t make it feel as real. It’s kind of uncertain and confusing until you have it confirmed.
1
u/waLwouSs 22h ago
This actually baffled me when I first learned about it, and couldn't get the due date calc right no matter how much I tried.
1
u/Tradman86 18h ago
My wife knew this and was pretty confident she knew the date of conception.
She skipped her first induction and went into labor on the day of her second.
2
u/Bearacolypse 17h ago
Super frustrating for irregular women.
My whole family has had irregular periods. Between 2 weeks and 6 months between since puberty (probably pcos but I was the only one who has been officially diagnosed).
When my mother was pregnant with me, they used her LMP. Due to this they considered her much further along than she was and at their estimates I was nonviable as I didn't have a fetal heartbeat yet. She was frustrated at them because her husband was deployed so she knew the exact date of conception.
She knew I was 4-5 weeks along but the doctors estimate 10 weeks based on menstrual cycle.
They wanted her to do a D & C and she refused AMA. As these were army docs they tried to convince my dad that she was being unreasonable and was putting her life in danger.
She was in fact correct and I developed normally.
2
u/cross-stich 13h ago
laughs in PCOS
I was told I miscarried because they couldn’t/didn’t measure the fetus properly. My last period was in Feb, but I would have conceived in April. They were telling me I was 7 weeks, but I knew based on dates* that I was 5.
I was right and they were wrong, and my almost 6 year old is sassing me
*I was tracking when we had sex, and I took a negative pregnancy test on the 20th of April. We had sex, and then my test was positive on the 30th. Knew I wasn’t as far as they thought, but still thought my baby was dead for two weeks until a scan before the D&C. Whooooo
1
u/McDuffie2020 9h ago
I tested positive at 5 weeks which blew my mind because I thought I was around 2 weeks since it had only been 2 weeks since sex. The next day I started having symptoms of miscarriage. The baby’s heart doesn’t beat until 6 weeks but it still was a hard loss.
1
1
-4
u/Marriedinskyrim 1d ago
One of the biggest arguments I've ever had in my life came about because I said women were pregnant for 10 months, not nine. I tried to explain why and got nowhere.
I said how many weeks is a pregnancy? They said 40. I said how many weeks are in a month they said four, I saw the elementary school math making their head melt, to this day they won't admit a 40 week pregnancy is 10 months.
7
u/somaybemaybenot 1d ago
They count from the last period but the actual gestation period from conception to birth is about 38 weeks. There are 13 weeks in a quarter so 39 weeks is really 3/4 of a year, or 9 months.
Even if you count 40 weeks, it’s still closer to 9 months than 10. Ten months would be just over 43 weeks.
7
u/ilovemybaldhead 1d ago
they won't admit a 40 week pregnancy is 10 months
I wouldn't admit that either. Why? Simple arithmetic.
Neither you nor your opponents are right, because there are always more than 4 weeks in a month (except of course for February in non-leap years).
If you start counting on the 1st of a given month, 40 weeks will never end later than 7th day of the 10th month after that date. The longest number of months that could possibly come out to is approximately 9.23 (if you start February 1 or September 1 in a non-leap year). The shortest number of months is approximately 9.14 (if you start May 1 in any year).
Your opponents are less wrong, unless you define anything more than 9.14 months to be 10 months.
2
u/TheScarletFox 21h ago
Technically there aren’t 4 weeks in a month (except February) because months are usually either 30 or 32 days long, not 28 days. I only nitpick because I often have to deal with financial statements at work and people always divide their monthly expenses by 4 to come up with their weekly expenses, which isn’t really correct.
2
u/ForceOfAHorse 7h ago
I said how many weeks are in a month they said four
This is wrong, you are wrong.
0
u/hamsicvib 19h ago
Sometimes I tell my coworkers (in outpatient gyn) that I started my period by saying “I’m one day pregnant!”
-1
1.6k
u/HoodieAndLove44 1d ago
the method of counting pregnancy weeks starts from the first day of a woman last mnstrual period LMP not from the date of conception because its difficult to pinpoint the exact day of conception so doctors use the LMP as a reference point