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Original poster

Wrong Due date?

305 replies

Deanna9 · 03/06/2018 10:20

I have a question about my due date, I and my partner think it's wrong going on what we know about ovulation.

Period on the 30th Sept 17- 3rd Oct 17

Sex on the 6 oct 17

Sex on the 20th oct 17

Period on the 21st oct 17- 23rd Oct 17

This makes conception after the 20th impossible so how is my due date the 6th sug 18.

Ive not had sex at all since the 20th of October so I know I can't have gotten pregnant after that.

OP posts:
Ifuckinghatethatdog · 04/06/2018 10:57

9 months +7 would make edd 28th July. You have been put back 9 days at your scans.

You keep mentioning a 21 day cycle, but after giving birth your cycles take about 8 months to regulate.

Can I ask if you’re breastfeeding?

LisaSimpsonsbff · 04/06/2018 10:57

I don't think your period at the end of October was a period at all. If you had a very brief bleed on 21st October, after you had sex, this sounds like you had implantation bleeding. I had similar with my youngest, a brief bleed when my AF was due. So this would match up with your dates.

Argh, no no no don't tell her this because then it makes every single scan she's had weeks out (which is what she thinks) and this is impossible!

Original poster
Deanna9 · 04/06/2018 11:01

July 28th sorry making it 9 days out

OP posts:
BlueBug45 · 04/06/2018 11:04

Well then she lied to me on my booking in appointment didn't she because that's exactly what she said to me.

No she didn't. She made an educated guess.

The scans are also educated guesses. However as they all agree with each other and are likely to have been done by different sonographers, then they are more likely to be a better estimation of your due date than going on your LMP.

BTW 21 + 7 = 28 If you can't do basic addition then it isn't surprising you have difficulty working out your estimated due date.

Original poster
Deanna9 · 04/06/2018 11:05

I breast fed till my son was 3 months, it never effected me bleeding every three weeks and the doctors agreeing they where periods because I was worried there may be an issue.

OP posts:
ZibbidooZibbidooZibbidoo · 04/06/2018 11:05

Why are you keeping multiple records of when you have sex OP?

Rachie1973 · 04/06/2018 11:05

Deanna9
July 28th sorry making it 9 days out

A midwife just told you a 9 day tweak is acceptable.

Rachie1973 · 04/06/2018 11:08

I'm really not understanding why this is an issue anyway. So your due date is different now.

That's it. No more complex than that.

Original poster
Deanna9 · 04/06/2018 11:09

Because I like to keep track of things zibbidoo, means I know when things happen surprisingly.

Rachie I know I counted slightly wrong.

OP posts:
BertieBotts · 04/06/2018 11:12

If you have 3 week cycles then you could potentially ovulate 4-7 days after the start of your period - that's how you would have conceived after your period. It's not normally possible because most people ovulate on around day 14 of their cycle, but that is based on an average of a 28 day cycle, and yours is shorter. I would suspect that you ovulate in the first half rather than the second half because if you have a second half (luteal phase) which is shorter than ten days usually this is too brief for implantation and pregnancy to successfully occur.

We don't actually know how long sperm live, the 5 days is an estimate based on sperm testing/assisted conception, once they are in the fallopian tubes it's a fantastic perfect environment for them so some sources suggest they could live for 7 days, or even longer although the longer they are there we believe the quality deteriorates. You can't cut open a fallopian tube to check, so we just don't know. Unless you were tracking ovulation by BBT, you don't know for certain when you ovulated, either, but as I said I'd put money on the fact it would be in the first half and likely somewhere around days 5-9.

You're a perfect textbook case for why it's possible to get pregnant at any time of a cycle including when you're on your period - because all women's cycles are different.

ZibbidooZibbidooZibbidoo · 04/06/2018 11:14

means I know when things happen surprisingly.

Or not as this thread shows! Grin

ForEverlong · 04/06/2018 11:16

ifuckinghatethatdog the due date from the 21 Oct period could make sense given the variables. However the OP has not had sex since the 21 Oct

Original poster
Deanna9 · 04/06/2018 11:17

Thank you bertiebotts

OP posts:
MyDcAreMarvel · 04/06/2018 11:24

Ffs when they said the fetus was 7 weeks from conception they’ve meant since you conceived as in since you became pregnant. They did not mean you conceived exactly 7 weeks ago! It would have been 5 weeks.

Ifuckinghatethatdog · 04/06/2018 11:24

Going by lmp/scans/measurements, It’s impossible that the intercourse you had on the 20th October resulted in this pregnancy.

There are a few explainations for the positive test on 10th November

  • very rarely, it could be leftover hcg from your previous pregnancy.

Most likely - the 21st October bleed could have been an early miscarriage/chemical pregnancy which could still show hcg in your system on the 10th. You then caught pregnant almost straight away which resulted in this pregnancy.

Did you take a picture of your positive test?

ForEverlong · 04/06/2018 11:28

@bertiebotts taking your hypothetical example. if the op conceived on the 5th day of her cycle, that would be 25th October. That’s 12 - 17 days prior to the most likely conception dates for her due date

Original poster
Deanna9 · 04/06/2018 11:34

No I didn't. I panicked a few times between the 10th nov and Dec 20th so took a few test but only took a picture of one one the 28th Nov to send to a friend in uni. I figured I'd wait till what I thought was 6 weeks to tell friends.

OP posts:
Anotherdayanotherdollar · 04/06/2018 11:34

I definitely want to know what happens here...I almost can't believe its a second baby and op seems to have zero understanding of how pregnancy is calculated. Every antenatal visit I've ever had started with "how many weeks are you now?" Surely the dates were out all during the last pregnancy too!

LisaSimpsonsbff · 04/06/2018 11:36

The first scan 'dated' me at 0.0 weeks as just a sac was seen but sonogrspher said the sac was measuring at 5 weeks on the 6th December.

This is the absolutely crucial piece of evidence, I think. If you had been anything more than six weeks at this point - so had conceived anything more than four weeks previously - then this would have shown it was a non-viable pregnancy. So that means it is just not possible that you conceived any earlier than 8 November.

ZibbidooZibbidooZibbidoo · 04/06/2018 11:37

only took a picture of one one the 28th Nov

Which is conveniently 15 days after conception would have occurred Hmm

LisaSimpsonsbff · 04/06/2018 11:39

It also means you can't have got a positive test for this pregnancy (as someone said above, possible that you had an early loss without realising) on 10 November, as, again, if a scan had shown just a 5 week gestational sac 3.5 weeks after a positive test then that would also show inevitable miscarriage.

Original poster
Deanna9 · 04/06/2018 11:40

Dates weren't an issue the same way last pregnancy as I had no idea when I'd had a period then due to problems I was having so technically my midwife then did pull a possible date out of her arse based on the date I'd had sex, my sons first scan was a 13+1 weeks.

OP posts:
Original poster
Deanna9 · 04/06/2018 11:42

Again I've not had sex since the 20 Oct so can't have had a miscarriage and gotten pregnant again in November unless I really should change my name to mary

OP posts:
LisaSimpsonsbff · 04/06/2018 11:47

Look, you've been told repeatedly that it is literally impossible that sex on the 20 October resulted in this pregnancy given all the information you've given. You can either accept that or (clearly) not, but the answer isn't going to change.

BlueBug45 · 04/06/2018 11:53

Dates weren't an issue the same way last pregnancy as I had no idea when I'd had a period then due to problems I was having so technically my midwife then did pull a possible date out of her arse based on the date I'd had sex, my sons first scan was a 13+1 weeks.

No she didn't pull a date out of her arse. She made an educated estimate due to her knowledge of embryology.

Then the various sonographers, who scanned you, using their knowledge of fetal development then gave a better estimated due date.

Due dates are estimates whether they are done by using LMP or scanning, and are wrong in 70% of cases. This is why many posters on this thread don't understand why you are making a fuss.