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I had two ultrasounds which were both done in my second trimester what are the chaces of them being accurate? They both have measured me 5 days ahead of what I'm supposed to be. EDD is 12/14/12 and DD from u/s Is 12/09/12. My last know was 03/09/12 which was light. Is it possible that's why I'm measuring bigger because I'm further along?

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Hi Belle,

Congratulations!

No test can pinpoint EXACTLY the age of the fetus.  Just like people, fetuses develop differently.  It's all an average and estimation.  Remember too, the picture isn't exactly crystal clear.

Most doctors base the age on your LMP.  Why?  Because almost all women know when that was, exactly.

9 months from 3/9 would work out to 12/9.  

Hope it helps.
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THANK you for your answer. Is it possible to conceive that quickly after a period? That means I conceived right after that light period putting my conception date around March 18th. I know it's possible just seems everything happened quickly!
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Anything is possible.

You can't really tell for sure when conception occurred. If you knew when you ovulated that would help, exactly, not just an assumption. Otherwise, it's all in the "ballpark."

It can happen quick.
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Not exactly sure on when I ovulated since my last period was 01/21/12 and I missed February then I had an early one in 03/09/12. My periods tend to be irregular at times and I don't really keep track of that and I know ovulation calculators aren't really accurate.
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