A member asked:

Jan15 last cycle.no cycle n feb.whole body ctscan done on feb20.preg test takn on feb 20(negavtive).march4 preg test positive. i'm worried i was pregt?

A doctor has provided 1 answer

1 week: Pregnancy tests can be negative for almost a week even though a pregnancy exists. If a pregnancy test on 02/20 is negative, the woman could have conceived around 2/14. By March 4 she would then be about 5 weeks pregnant, assuming a LMP of 2/1/16. Alternatively, the woman could have conceived Feb 26. A transvaginal ultrasound on/after March 25 would reliably tell the gestational age/conception.

Answered 11/28/2017

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