Have you had a big discrepancy with your scan dates and period dates?

[addler]

Mine are 12 days apart, which seems a lot and even my midwife was surprised especially seeing as I have regular 28 day cycles and had a positive test the day my period was due.

I'm term by my period dates but 36 weeks by scan dates. If you had a big gap did you go in to labour closer to either date? I went overdue with DS1 with no signs of anything happening so I was expecting the same with this one, but have had some period like pains over the weekend. I don't really want to go in to labour before my scan dates say I'm term as there goes the water birth!

Has there always been that discrepancy? I remember being told as pregnancy goes on there can be an error rate of 30% either way on scans. I've always wondered why they put so much pass on them to be honest - my first ob/gyn was more old school but not my recent ones..
I know of a baby who was delivered early by C section as scan was showing they were too small, there were 7lbs something!
Can they not just go by your period dates when you know they are accurate?
I remember at a 5 month scan I had the sonographer wanted to change my due date by 10 days and I wouldn't let her as I knew it was physically impossible that baby was that much older..
It does suck if you want a water birth and it might not happen but at the same time better for baby to come when it's ready no matter what :-)

Not period as such, but I know exactly when DC2 was conceived. Scans put him a week behind my dates. I had him on 40+1 officially, but was probably 41 weeks and a couple of days.

It was delayed at my 12 week scan, they couldn't do the scan as they said it was too small and was a 10 week old foetus, so it was a very nerve wracking wait for two weeks thinking something was wrong. I don't know whether it would've been affected by my BMI which is high, and in my first pregnancy they did an internal scan at 12 weeks due to that but this time it was only abdominal.

At my 20 week scan they kept asking what my period dates were and what they dated me as at my 12 week scan, but wouldn't say anything else about it.

12 days just seems like a big difference!

I'm hoping that if I go overdue again this time (by my period dates) I'll actually be closer to my scan due date so won't have as long to wait, if that makes sense?

I guess the only thing I'm worried about is if I go overdue by scan dates will I actually be really overdue by period dates and then it's less safe?

Mine were totally out, I knew exactly when I conceived, long cycles etc but scan dates disagreed and put me as overdue when I wasn’t.
consultant wasn’t having any of it, though!
I had expectant management, they were determined to deliver my 6lber early.
he was 10lbs and born exactly 42 weeks by my dates, way over by theirs!