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A 21-year-old female asked:

Sex on the day before ovulation day. took a plan b on ovulation day (25 hours after sex) chances of pregnancy ?

1 doctor answer4 doctors weighed in
Dr. Lori Semel
Pediatrics 35 years experience
Low: 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 Apr 8, 2018

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