A member asked:

My cycle length varies each month, sometime its 30,32,35 then still my pregnancy lasts for 38 weeks from dt. of conception or it would be early/late?

3 doctors weighed in across 2 answers

Range of normal: Your cycle length won't influence your length of gestation. Your due date is calculated from your last menstrual period and assumes a 28 day cycle. It is 40 weeks from LMP or 38 from the day of conception but this is an average and any where from 35 to 40 weeks from conception is considered normal. Hope this helps.

Answered 11/14/2014

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Dr. Dennis Higginbotham answered

Specializes in American Board of Obstetrics and Gynecology

Correct: Yes, the due date for a pregnancy would be 38 weeks after conception. For a woman having 28 day cycles (ovulating on cycle day 14) that would work out to 40 weeks after the last period started. In your case the LMP would not be an accurate indicator of gestational age because you are ovulating about 16 to 21 days after your period starts,

Answered 11/22/2014

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