A member asked:

On or after ovulation day had unprotected sex, no ejaculation. took plan b 22hrs later. chance of pregnancy?

A doctor has provided 1 answer
Dr. Martin Wolff answered

Specializes in Internal Medicine

Very low : Plan b is very effective at preventing pregnancy when taken 72 hours after interocourse. In a study of over 6000 women, the risk of pregnancy when taking Plan B within 24 hours was less than 1%.

Answered 7/21/2014

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