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A member asked:
If days in between my period vary from 28 to 26 days every month does that make my first ultrasound in the first trimester less accurate?
A doctor has provided 1 answer
No: Unless you do fertility therapy most people do not know the exact moment they conceived. The due date is an approximation not an exact date. Ultrasounds only predict due dates in the first trimester within 7 days and ultrasound dating of pregnancy gets less accurate in the second and third trimesters.
Answered 1/12/2016
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