Accuracy of dating ultrasound?

posted 2 years ago in Pregnancy
Post # 2
Member
1531 posts
Bumble bee
  • Wedding: January 2013

my dating ultrasound was spot on to the day… i went in at 8 weks 3 days and thts exactly what it calculated.

Post # 3
Member
2839 posts
Sugar bee
  • Wedding: June 2013

Dating ultrasounds are generally accurate +/-6 days.  So if it said you were eight weeks, you could really be more like 8w6d. But there’s a huge difference between what a baby looks like at eight weeks and eleven weeks, so it’s unlikely you would have measured that much smaller if you were really closer to 11 weeks. Everyone’s body accommodates a growing uterus differently though! Sounds like yours just popped early. 🙂

Post # 4
Member
3360 posts
Sugar bee
  • Wedding: December 2011

My dating ultrasound was off by one day from when I know I ovulated – I know they can be off by a few days, but likely not as much as 3 weeks!  Doesn’t your uterus grow at a faster pace during your second pregnancy, though – kind of like it already knows the drill, so it gets the show on the road sooner than the first time around?  Maybe that’s why you can already feel it.

Post # 5
Member
1185 posts
Bumble bee
  • Wedding: September 2016

My dating ultrasound the first time was off by a week. But the reason they do them is because they are more accurate then blood tests and LMP calculations. Is this second baby? I would be more  opt to trust the ultrasound. You probably ovulated late.

Post # 7
Member
8593 posts
Bumble Beekeeper
  • Wedding: September 2013

I thought early ultrasounds were very accurate with regards to the due date.

I sometimes wondered if my due date was accurate (only because I was induced with no labor signs at all at 41w and they had previously moved my EDD up by 3.5 weeks and my baby was small compared to both me and my husband as babies and our sizes now) but both of my ultrasounds at 16w and 20w were very close with their EDD and they told me at that stage they were still pretty accurate.  I thought the earlier the ultrasound the more accurate it is.  I never had an earlier ultrasound.  I had what I thought was a period so that is why my original EDD based on LMP was so off, I think it was implantation bleeding or a result of that being my first month off of BCP.

I think this is because it’s your 2nd pregnancy, you usually show earlier.

Post # 8
Member
940 posts
Busy bee
  • Wedding: September 2012

Mine was a tad off – baby measured 7 w 6 days, but based on O date I was 8 weeks 1 day.  In any event it was like a 2 day difference, and the doc thinks its just measuring small.

Post # 9
Member
863 posts
Busy bee
  • Wedding: June 2012

stillme:  I am 11 weeks with my second pregnancy and my uterus popped up at about 6 weeks. It’s been kind of nice because I don’t have to pee as much as I did with my first. 

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