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A 33-year-old female asked:

Had sex on an assumed first day of ovulation, did not take plan b until 4 days later. (just learned of it) what are my chances of pregnancy?

1 doctor answer1 doctor weighed in
Dr. Douglas Krell
Obstetrics and Gynecology 45 years experience
Depends...: There are so many factors that will predict chances of pregnancy; age and state of health to name 2 important ones. Generally we say that the Plan B method is 60% effective if taken on the 3rd day after sex. Some data suggests its effectiveness lasts through the 5th day post intercourse... but the numbers are unreliable. If you're

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Last updated Aug 4, 2015

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