A 22-year-old female asked:
Disclaimer

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?!

1 doctor answer
Dr. Robert Kwok
33 years experience Pediatrics
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 on Nov 15, 2015

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