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A member asked:
Lmp was feb 18, due date of nov 24. 6 week ultrasound and 8 week ultrasound due date of nov 19. putting conception on day 10 of my cycle (feb 27). 5 day difference in due dates. when did conception occur? could it have been before my lmp?
A doctor has provided 1 answer
Life is never exact: Ultrasound dating scans in the first trimester, such as at 8-11 weeks, are accurate... meaning plus or minus one week. Especially if the doctor feels the fetus is growing appropriately for gestational age through the course of the pregnancy, the dating estimates were likely very accurate. November 19 and Nov. 24 "are the same day" when it comes to estimating pregnancy dates. Life is never exact.
Answered 9/24/2020
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