Sure there’s been a mistake with my due date

[duedatemistake]

Has anyone had their due date be wrong by about a week ?
I’m positive mine is wrong and it’s worrying me. Because I have to have a c section early I’m worried they will calculate it wrong but I’ve been told as I had many scans before 12 weeks that my due date is accurate and I think this is wrong ?
Just wondering has anyone else had this kind of an issue

What makes you think it's wrong? Scans are by far the most accurate way to date your pregnancy. I'm dated 2 days ahead of my original date from LMP. I'm 39 weeks now, had 5 scans in total and all have dated me the same.

Why do you think the scan is wrong ?

As pp said, why do you think it's wrong?

My LMP had me due on 9th Aug, early scans said 20th Aug then dating scan said 13th Aug.

I am going with the dating scan as that fits in best with when I think I conceived.

Bearing in mind, babies are considered term from 37 to 42 weeks, it really is just a guide anyway.

Because my lmp was 23 November and we only dtd on 8 and 10 Dec and my cycle is approx 33 days (sometimes 35 but regular)
My initial scans up till 9 weeks gave me a due date of 2 sep
Then from 9 weeks each scan up to 13 weeks they kept saying my due date was 26 aug
But I can’t see how it works out plus I have big babies but I was under the impression all babies are the exact same size till 12 weeks ? I’m measuring a lot ahead now so have to have growth scans
My concern is baby’s lungs at birth I have to have my c section a bit early but then what if it’s actually a week earlier still due to my due date being wrongly calculated ?

Hi - can see why you’re confused, it all matches better with a later due date, ie 2nd sept. Have you seen an obstetrician to discuss the CS yet? You will probably find they’re fine to push it back by a week but it depends a little on the reason for CS. If you’ve already got a date booked talk to your midwife to see if you can arrange another discussion. I agree that if you can, it’s better to have the CS a little later.

With my daughter I was sure of dates but at my 12week scab they pushed the due date back by a week. I said I did think they were wrong but they insisted they were right. Towards the end I mentioned to midwife again about dates being slightly out and I was told go with scan. I had her at 38weeks exactly and she weighed 7lb. I do believe my initial dates were correct but as they class full term as anything over 37weeks I think they just go with what they think from scan.

I think my big worry is having a baby that’s bigger than average but actually less mature than the drs think due to the scan date being wrong and then I’m worried about lungs/breathing issues at birth if so.
I’ll chat to them at my next appt. I just couldn’t see how it was working out when my period and other dates match more with my first due date than the revised one and was getting stressed !

My lovely scan team told me there is a small margin of error with dating scans (up to a week either way).
But I believe if all the teams know this, it can't be too much of a concern from a medical perspective, however, definitely talk to your midwife around your concerns.

I think my due date is off by about half a week to a week (purely based on the conception date and that we didn't start DTD that month till at least a few days later). From what I understood it could also just be a growth spurt and the baby gets measured again at the 20 week scan and if the size is really off, they will recalibrate the due date. So for now I'm rolling with my dating scan due date.

Babies don't all grow at the same rate before 12 weeks at all, they grow at very different rates that's why the nhs won't date you until 12 weeks when they can get accurate measurements. I'd be inclined to trust the 12 week dating scan and ignore the early scan dates. Plus a baby is classed as term by 37 weeks so even if the dates are out by a week they'll surely be fine. Plenty of plan use are born around 36/37 weeks and are totally healthy, i think you'll be fine, good luck xx

I keep getting told that 37 weeks being term only applies to vaginal deliveries that fro c sections there’s something different and those babies before 38/39 weeks Often have breathing issues as they haven’t gone through the birth process I’m just worried if I’m booked for 38 w what if my days are wrong and I’m actually only 37 I’m hoping things will be ok

If your baby comes at 37 weeks, it's long all be as mature whether it comes behind or C Sec.
C Sec babies aren't squeezed the way vaginally babies are, so they can be a bit wet so they are more likely to need a BIT OF SHORT TERM assistance but the risk is SMALL.
37 weeks is still term but they'll freak with how baby presents so if baby needs help, they'll get it.

I had my due date brought forward too and I'd been peeing on ovulation sticks, the lot. In the end twins came at 36 weeks C Sec, absolutely fine

I'm due 27th Sept, my cycles are short at around 25 days. MW worked my EDD to be 7th Oct whereas I had worked it out to be 3rd, I then had a scan at 9 weeks which said 30th Sept. scan at 13 and 5 days weeks then had me at 27th Sept. I don't know how much they work it out but I'm just going with it.

I knew my dates exactly as it was an IVF pregancy but the hospital changed it by a week based on the scan measurements (they dated me a week further) They told me the scan measurements trumped the conception dates. I was induced at 39 due to him being a large baby but my true dates were 38, he came out 9lbs so I'm glad they amended the dates

38 weeks is absolutely fine to have baby. In fact, 32 weeks on, unlikely to have complications. I have big babies and each time they have put my due date a week forward. You can always ask them to wait until 40 weeks for c-section if worried. They can't make you have baby earlier than you choose if you stick to your guns. Good luck!

They can't force you to have the c-section you can agree to a planned one when you are sure you are x weeks pregnant and if you go into labour before that then it will be an emergency c-section.

Why are you needing one this time around?

At my dating scan they dated me 5 days ahead - I know when I ovulated because I was temping, and I'm similar to you, LMP was 24 November, and based on known ovulation, I'm due 1 September. The 12 week scan put me fwd to dd 28 August.

If you had sex 9/10 Dec then likely you ovulated on one of those days or just after because sperm can live up to 5 days but the egg can only live for 24 hours. So I would say you are correct, that your due date is probably actually later. I ovulated on 10 December incidentally! :)

Babies all grow at different rates and if you have big babies likelihood is they have dated you ahead but actually baby is more likely to be 40 weeks a bit later on.

Depending on the reason for c-section, you could ask them to go off your dates not the scan date - I plan to do this if they suggest induction (I'm going to refuse unless a good reason till I'm 42+4 because I've done my research and want to avoid it if baby is fine, plus according to my dates, I'll only be 42 weeks then.

It's YOUR choice you don't HAVE to do anything, remember that. xx

If it's any help, I was born by c-section at 37 weeks 30+ years ago and I was fine :)

I’m in this exact position. I know my lmp date, I know when I ovulated and I know when we dtd. The hospital is still going in scan date. My consultant said it’s more accurate. I’m due to get my c section date on Friday and I’d they go with 39 weeks I’ll be 40 plus 1 by my calculation. This is also my 5th pregnancy and I’ve never had the date changed at a scan before this one, always had regular periods. They don’t want me to go in to labour naturally yet my last 2 babies I’ve gone in to labour at 38 plus 6 and 39 plus 4! I actually feel like going in on Friday and saying I’m not having an elective c section as what is the point when it’s likely to end with me going in to labour then it being an emergency. May as well just go done that route anyway!! I’m so frustrated they won’t listen to me When I know my body! If I didn’t have to have a section I’d be fine as I’d quite happy for my body to do what it has to but the hospital have put the fear of god in to me saying they are avoiding me going in to labour!!

I don’t believe in due dates ! It’s more like birth month 🤣! I wouldn’t worry at all !

With my first baby I measured a week ahead and I was like HOW??!! I thought I would go weeks past my due date thinking they got the due date wrong but baby came at 37+1 as an average 3.5 kilo full term baby .

Now I’m pregnant again but only had sex once the whole month , on my period . I was certain I would be measuring ahead by at least a week if not more . Nope! Baby is measuring exactly on track . A part of me thinks they measured wrong but a bigger part of me doesn’t care . At the end of the day a due date means very little . Full term is anywhere from 37-42 weeks . That’s a 5 week period .

I'm following this with interest, as I have the same worry OP, and have in the past too. I know without doubt when I ovulate etc, but the scan disagrees and dates me a few days further along. I have the same worry about early c sections. I have wondered (although this is only my own theory) if the discrepancy lies in the fact that, although we know when we ovulated etc, we don't know when implantation occurred?! As it can happen anywhere from 6 to 12 DPO (I think), that's quite a big window. Could the difference lie there I wonder? What do others think?

Yes I think maybe the implantation date could be the reason as can’t see what else it could be ?

I hope that is the reason, because perhaps then it would be able to put our minds at rest. On a good note, my babies have not so far experienced breathing difficulties due to a c section taking place earlier than I would have predicted!