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A 21-year-old female asked:

Sex on 8/17 and took plan b 16 hours later. period was due on 8/21 and came right on time. does this mean the pill worked?

1 doctor answer4 doctors weighed in
Dr. Jeff Livingston
Obstetrics and Gynecology 24 years experience
Sounds like it: Since you had your period it sounds like Plan B worked. you should always check a pregnancy test to confirm. If you think you might be pregnant check then check a home pregnancy test. They are cheap, reliable and available at any pharmacy.
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Similar questions

mn
A 21-year-old female asked:

Sex on 3/17, plan b 16 hours later. Period due on 3/21 and got it right on time. Does this mean plan b worked?

1 doctor answer1 doctor weighed in
Dr. Georgia Latham
Family Medicine 37 years experience
Yes: Having your period on schedule indicates that you are not pregnant. Plan B is ~95% effective in preventing pregnancy if taken within 24 hours, and ~89% effective if taken within 72 hours. Plan B is should not be used repeatedly. You should start a reliable form of birth control as soon as possible, and should always use condoms to protect yourself from STD.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Apr 12, 2015

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