Medical Questions > Pregnancy Forum > Pregnancy Calendar Conception : When did I Conceive ? Forum

Gestational age ?

every ultrasound i have had has dated back to june 11th gestational age.and all 3 ultrasound visits my doctor has insisted on a due date of march 18th. but i did not start my period on june 11th? it makes no sense. i have very irregular periods, does this have any effect??
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replied September 24th, 2009
Especially eHealthy
The ultra sound gestational age is normally based on your ovulation date (38 weeks vs. 40 weeks menstrual gestational age). So you had to have had sex a few days before that or on that date.

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