A member asked:

On may 14th the doctor told me i was 6 weeks pregnant threw ultrasound . when did i concieve ? currently 30 weeks pregnant . don't know last period .

A doctor has provided 1 answer

16 April 2014??: Measurement of CRL (crown rump length) of the embryo/fetus during the first trimester is considered the best indicator of duration of growth of the fetus. Assuming that the CRL was consistent with 6 weeks on May 14th, 2014, the conception date is most likely April 16th, since ultrasound dating uses first day of last period as day 0 to date the pregnancy.

Answered 10/25/2014

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