Can a dating scan be 6 weeks wrong

We value your feedback I don't even know if that is possible! It would have had to implant then send out the hormone to be picked up? What do you think?

Should I change my dates? Should I get a repeat scan later on?

Ultrasound of Normal and Abnormal early pregnancy

Should I just stick to my own dates? This is my 3rd child and I've had dating scans for all my babies, and the others lined up with my own dates by charting. My last pregnancy my dating scan was two weeks off. The day they said I conceived, my period was due. But let me tell you, I gave birth the day before they said my due date was mummy to gods gift to us.

That's only 5 days difference which isn't very much. I have read that some sperm can live up to 10 days if conditions are favourable. And you can get a pos HPT as early as a week after implantation. Early dating scans are considered the most accurate, later scans not so much. Yes my dating scan with ds was over 1 week out.

Ds is now 6. The sperm can live for days but the egg will pass through within 24 hours. You were obviously fertilized when you ov'd but the egg too a few days to implant properly I would guess.

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  • Wrong due date from ultrasound scan - why it happens | MadeForMums.

The dating scan date is the most accurate date but remember that the baby is really little t six weeks and a slight change in how they measure the bub can change your dates. Go by the later due date rather than the earlier one. It will mean a great deal at the end of your preg, just in case bub wants to stay in a bit longer.

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You don't want to be pressured into an induction when you are only five days over, because you went my lmp rather than dating scan. My dating scan was off by at least a week and then my 12 week scan was off by 2w3d. I spoke to my midwife about it and showed her the dates I had worked out and we worked out a compromise date put me forward by a week more than the first scan.

We were only worried about it because I have a history of prem babies and a week or two could be the difference between needing to be transferred to a larger hospital in Melbourne as opposed to delivering at our local hospital.

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She told me that they would normally not change the due date from a dating scan unless the next scan dates were off by at least 2 weeks and your not you personally, obviously fundal measurements corresponded to that date. I'm still measuring 2 weeks bigger by fundal height but haven't had another scan so we're sticking with our agreed date for now. From what i was told with DD2 there was a dispute about when she was due as different scans showed about weeks difference and it didn't match when i thought i conceived and i only had sex once blah blah.

Anywho i was told the early dating scan is the most accurate as babies grow at the same rate for those first few weeks so this is the date that was used. In retrospect i think it was fairly spot on. Connect with like-minded professionals and have your say on the issues that matter to you. Has anyone else experienced this? From reading quite a few posts, most people seem to move a couple of days not nearly 3 weeks. Have you gone back through your dates and double checked? I'm sure you have but that is all I keep doing.

I hope someone can give you a more comprehensive answer but wanted to add my voice to your enquiry. LRRS , Jul 28, Are you going to get a second opinion? My mum and step dad conceived my brother accidentally on their first night together and they've been happy together for 17 years.

I hope it works out for you! Am I right in thinking I just move the old due date forward 4 days?! Sorry if that sounds thick!! The first date was based on LMP long cycle! The offical answer is that they are accurate to 4 days. On the other handI know many people who know when they conceived for various reasons. At the end of the day the measurements are just averages. Babies end up all sorts of sizes so it is likely that they will grow at different rates.

I know that I conceived on one of 2 occasions in one week. I haven't worked out if those fit with my dates, maybe I will do that! I know my friend was measuring a couple of weeks ahead at 12 weeks, but is back to what she should be now, at 20 weeks. As others have said, there can be huge variation!

Can your pregnancy scan give the wrong due date?

Bsmirched , Jul 29, Hi new to writing on here but have been reading lots of useful advice from you all. Dating scans work on the assumption that the length of all babies in the first 14ish weeks progress at exactly the same rate. Which seems a bit odd to me considering that length of cycle, birthweight and everything about the mother vary such a lot.

A friend of mine had her dates pushed back by about 3 weeks, only to have her baby 5 weeks 'early' but with no more complications than you would expect for a 2 week early baby, she is firmly convinced she was right all along! Sorry to hear it can put some people in such difficult situations. Guess it varies place to place, or my midwife doesn't trust the sonographer!

She'd already written Dec 6 on my file the scan results say Dec 2 but they have left Dec 6 as the date for my MAT B1 form, lets face it, won't make any difference to when the little person decides to arrive! When I had my son, I was moved forwards by almost two weeks and despite what I said they refused to change it. When he was delivered by section at 37 weeks, he was apparently a typical 35 week old baby - small and very hairy!

Welshlizzie , Jul 29,

Why would I have a dating scan?

The waiting is absolutely horrible and never ending. March 7, at 1: Good girl emmsiebubbles, try to keep the spirits up! She told me that they would normally not change the due date from a dating scan unless the next scan dates were off by at least 2 weeks and your not you personally, obviously fundal measurements corresponded to that date. Just been reading your posts…I really hope you get positive news. Do you already have an account? Especially in case there might be a problem as you would be referred there after next scan anyway …….