Active discussions

Meet the Other Phone. A phone that grows with your child.

Meet the Other Phone.
A phone that grows with your child.

Buy now

Please or to access all these features

Talk
Pregnancy

Talk about every stage of pregnancy, from early symptoms to preparing for birth.

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:
Original poster
Deanna9 · 03/06/2018 22:42

Counting back 10+4 puts conception at 13th of Nov which yes puts my due date on the 6th Aug.
Implantation would have to be on the 13th Nov for that to make sense so sperm had to survive till at least the 4th Nov as implantation occurs 3-9 days after fertilisation. So 3 days after fertilisation on the 4th Nov would be the 7th Nov and 9 days after would be the 13th Nov.

Explain sperm living 15 days which is 10 days more than is scientifically possible and through a 3 day bleed at that.

OP posts:
Original poster
Deanna9 · 03/06/2018 22:45

My lmp was the 21st October, I know this because both me and my fiancé put it on our calenders.

OP posts:
ZibbidooZibbidooZibbidoo · 03/06/2018 22:48

So the 12 week dating scan that dated you at 12+4 gestation is wrong? That’s what you’re saying? And the 20 week one. You said people make mistakes and I think it’s you that have made the mistake here. You’ve had sex at a later date and forgotten about it.

Emma198 · 03/06/2018 22:50

Who said anything about sperm living 15 days? Think you're better off just speaking with your midwife and/or a doctor.

Original poster
Deanna9 · 03/06/2018 22:52

No I really haven't as my partner refuses to have sex with me while I'm pregnant and we also write when we do on the calender to keep track for this reason.
I found out I was pregnant on the 10th Nov so unless I had 3 magic pregnancy tests that day that predict the future then no I didn't conceive in November which is what the scans tell me.

OP posts:
Bluebirdsky · 03/06/2018 22:54

So you are saying that they just so happened to book you for your 12 week scan at exactly when you were 12 weeks, that at that scan the baby just happened to actually measure 12 weeks when it should but they are all wrong and you want people on here to explain how to you? I think it's not us who needs to explain!

Original poster
Deanna9 · 03/06/2018 22:56

Emma it would have had to for fertilisation to occur on the 4th Nov because I last introduced any sperm to my body on the 20th oct.

It's impossible to get a positive test 3 days post implantation or 3 days before it so.

OP posts:
ZibbidooZibbidooZibbidoo · 03/06/2018 22:59

Well I’m completely stumped. The 12 week scan is as accurate as you will get tbh so thats what you need to go by until the baby is born. The midwives don’t tell the scan what to say, the scans tells them! So it isn’t human error and even if it was, the 20 week scan wouldn’t have had the same error. I’m guessing it was done by a different person?

Is there any chance at all your Postive test was 10th of December? It’s easy enough to make the mistake once and then carry on working everything out based on that mistake without realising.

Original poster
Deanna9 · 03/06/2018 23:01

Ive already said I'd be asking my midwife. And will be asking my consultant if I still don't think it's right.
I asked on here for opinions as that's what forums are for, hashing it out helps and multiple opinions provide info I either didn't take into consideration or didn't think of myself.

I'd rather 'argue' with strangers for a day and be proven wrong than think I am wrong and something happen because I was right.

OP posts:
Original poster
Deanna9 · 03/06/2018 23:03

100% positive that my test was on the 10th nov.
A human takes the measurements even if the machine works correctly so there's defiantly room for human error.

OP posts:
ZibbidooZibbidooZibbidoo · 03/06/2018 23:07

Yeah but twice?

ZibbidooZibbidooZibbidoo · 03/06/2018 23:07

And both times arrive at the same date?

Original poster
Deanna9 · 03/06/2018 23:09

Yes twice, baby's also grow at different rates otherwise I wouldn't have been measuring 'big' at both my 26 and 29 week scans. Surely they can't be wrong either if neither my 12 or 20 week scan can't be. What makes those scans inaccurate????

OP posts:
ShowOfHands · 03/06/2018 23:19

You're also misunderstanding conception vs implantation. If you conceived around November 13th, that is when sperm met egg and the developing embryo would have implanted later than this.

Human error is possible yes but a 12 week foetus is nothing like a 17 week foetus and to get it so wrong again at the other scans is nigh on impossible.

Now, if the human error were yours, that would make more sense. If you shift all of your dates forward by a month, it all makes sense. So lmp from 30th Oct until 3rd Nov, sex on 6th and 20th Nov with ovulation between the two, implantation bleeding from the 21st and a positive test on the 10th of December... that all matches with the evidence provided by your multiple scans and midwife's observations.

ShowOfHands · 03/06/2018 23:22

Your later scans are only 5 and 10 days out. Utterly normal as it's harder to get accurate measurements later on and babies aren't so uniformly developed after 20 weeks. Hence the inaccuracy of weight guesses with later scans, as I said earlier.

ZibbidooZibbidooZibbidoo · 03/06/2018 23:26

I agree. I think you’re a month out on your calendar record.

MinsPei · 03/06/2018 23:29

You said upthread that you took a test in November a week after you'd missed your period. But the actual time between your last period and getting a BFP was three weeks, not four. So what was it that prompted you to take a pregnancy test if you hadn't yet missed a period?

Original poster
Deanna9 · 03/06/2018 23:38

My second ever scan was on the 20th December which showed a fetus of 7+3 weeks, had the scan due to severe cramping, my booking in appointment was on this day too.

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.

I can't get those dates wrong they are in my pregnant notes

OP posts:
Original poster
Deanna9 · 03/06/2018 23:42

I had in my books by the fact I start bleeding in the morning like clockwork not the evening when I took the first test and mostly gut feeling and curiosity on being able to test the first day of a missed period.

OP posts:
ShowOfHands · 03/06/2018 23:50

The 5 week scan and the 7 week scan also fit perfectly with a conception date around Nov 13th and a due date of Aug 8th. So you have 6 scans and all the associated medical professionals and scientific knowledge confirming these dates. Either many professionals and basic biology are wrong or you are.

ZibbidooZibbidooZibbidoo · 04/06/2018 00:03

Yep. They fit in perfectly with a mid November conception.

Original poster
Deanna9 · 04/06/2018 00:05

5 weeks after the 13th november is not the 6 December.
It's the 18th Dec.
7 weeks and 3 days after the 13th of November is not the 20th December.
It's the 4th Jan.

How are either of those scans right especially going off an lmp of 20th oct

OP posts:
ZibbidooZibbidooZibbidoo · 04/06/2018 00:28

Oh FGs!! You have been told this several times on thread already. If you are 7 weeks pregnant that means its 5 weeks since conception and 7 weeks from your last period. It’s no wonder you can’t work out when you last had sex.

Original poster
Deanna9 · 04/06/2018 00:48

Well would u educate my sonographers on that then because they don't work out your date on scan from lmp they measure a physical thing.

The midwife works out a date on your lmp at booking in appointment and gives you a scan date from 8 to 12 weeksas it says on the NHS website.

Directly quoted from the NHS website –check baby's size at the dating scan, this gives a better idea of how many weeks pregnant you are; your due date, which is originally calculated from the first day of your last period, will be adjusted according to the ultrasound measurements.

They do not take off two weeks from a dating scan or I would be right in thinking I could have been 14 weeks on the scan.

OP posts:
Original poster
Deanna9 · 04/06/2018 00:56

And so I was really only 3 weeks pregnant when I measure 5 weeks
And 5 weeks when I measured 7 weeks
And 10 weeks when I measured 12 weeks
And 18 weeks when I measured 20 weeks

Because what your saying is they automatically take 2 weeks off any date given to match you lmp.

Because a baby does not actually exist at all until fertilisation occurs, you realize at least right.

OP posts: