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A member asked:
I had my period dec 16 had sex. can't remember if my period was normal on jan 9. i am now 26 weeks pregnant, are the ultrasounds accurate?
5 doctors weighed in across 2 answers
Yes: Sonograms highly accurate and better than memory.
Answered 10/18/2013
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Ultrasound dating: It depends on the timing of ultrasound. First trimester ultrasound is accurate within 5-7 days. 2nd trimester ultrasound has accuracy of +/_ 2 weeks. Lmp dating also assumes a 28 day cycle. There is no test that can date conception more accurately than a 1 week window.
Answered 12/9/2013
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