A member asked:

Preg test on 3/20. lmp 2/7/ ,41 day cycle. last time had intercourse 2/28 ovulated 3/2. how far am i? i know my fetus is 3 1/2 wks, but preg calculator says 6wk? also when is the gestational sac seen on ultrasound based off conception. hcg is 1235

A doctor has provided 1 answer
Dr. Ralph Boling answered

Specializes in Obstetrics and Gynecology

most commonly is the date you are seeing in reference to dating of the pregnancy by ultrasound and most other methods. This is based on the first day of the last period. Timing centers of a 28 day cycle, 13 cycles per year. Ovulation day is usually day 14 of the the 28 day cycle. If ovulation varies, this causes changes in the specific cycle. This two weeks difference can be confusing.

Answered Mar 25, 2020

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