A member asked:

I took plan-b after morning pill last saturday. my last menstrual cycle was 10/13/15. also waitin on std results. could pos std counteract plan-b?!

A doctor has provided 1 answer

No: There is no STD (sexually transmitted disease) that counteracts the effectiveness of Plan B. One should do a home urine pregnancy test 3 weeks after taking Plan B, because Plan B works most of the time, but not all the time.

Answered 11/15/2015

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