25%: Chance of pregnancy is about 1 in 4 (25%). If you don't want to get pregnant, emergency contraception is an option. Taking Plan B One Step (or something like it) within 72 hours of this incident is 85% effective at preventing pregnancy. If taken within 24 hours it is 95% effective. It works by delaying ovulation. Best wishes!
Answered 10/30/2016
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