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Islandton, SC
A 24-year-old female asked:

Nov. 11th cycle ended. 23rd had sex, condom slipped & a bit of semen outside of vagina . an hour after, took plan b-1 step. any chances of pregnancy?

1 doctor answer3 doctors weighed in
Dr. Lori Semel
Pediatrics 36 years experience
Unlikely: Plan B can work in one of three ways depending on where you are in your cycle. It can prevent or delay ovulation, can interfere with the fertilization of the egg or may prevent implantation by altering the lining of the uterus. If you take Plan B One-Step within 24 hours, it is about 95% effective.

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Last updated Jul 2, 2015

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