A member asked:

If due date 07/27/15 what dates i gotten pregnant ? my dr thought i was 10 wks on 12/20/14 but actually was 8 wks. why she switch ?

A doctor has provided 1 answer

Due date: If at 10 weeks by dates you had an ultrasound and it said 8 weeks, I would have changed your due date as well. Your US and LMP date shouldn't vary more than 7 days if you use the LMP for due date in 1st trimester. Conception was likely around November 3. This is an estimate based on 28 day cycles, its not exact science.

Answered 6/13/2015

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