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A female asked:

I started my birth control pill about three days ago. i had sex last night and according to my app i start my fertile window tomorrow. could i be preg?

1 doctor answer2 doctors weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
Hard to guess: One can do a home urine pregnancy test if worried. A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test.

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Last updated Aug 7, 2015

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