A member asked:

Gf has peak ovulation from april 1-6intercourse on the 5th where some semen may have been injected in her vagina22 hours later took the plan b prego?

3 doctors weighed in across 2 answers

Plan B: Is 95% effective when taken within 24 hours of unprotected intercourse.

Answered 4/11/2015

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Not from this event: Plan B can be taken up to 72 hours after unprotected sex. Plan B will not terminate a pregnancy that has already begun. There are Over the counter pregnancy tests she can take if you are worried about a prior event.

Answered 4/11/2015

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