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A 27-year-old female asked:

Why would an ob change your due date from an ultra sound taken at 9 weeks of pregnancy but not mention until 3 days beore said due date?

1 doctor answer • 2 doctors weighed in
Dr. Marvin Ott
Dr. Marvin Ottanswered
Emergency Medicine 22 years experience
Common: Bonnie, it is very common to revise the due date based on ultrasound evidence, because it is much more accurate than the first day of your last period. Why they didn't mention it earlier, I can't say, but remember that guessing a due date is an inexact science. Only 5% of babies are actually born on their due date. Hope this helps!
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Dr. Carrie Giordano
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Last updated Aug 3, 2014

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Female health

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