A member asked:

2 periods not even 2 weeks apart, 2nd one lighter and shorter!! positive pregnancy test, what date do i use to calculate due date??

A doctor has provided 1 answer

Dr. Shari Schabowski answered

Calculating dates: Last NORMAL menstrual period is what dates are calculated from (although it is not an exact science). It is not at all unusual to have a light or irregualr period early in pregnancy. Early ultrasound is very reliable for dates.

Answered 7/10/2014

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A member asked:

2 periods not even 2 weeks apart, 2nd one lighter and shorter!! positive pregnancy test, what date do i use to calculate due date??

A doctor has provided 1 answer

Dr. Shari Schabowski answered

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