A member asked:

Hello. i am 17teen. one week after my cycle my boyfriend ejaculsted inside of me. i took plan b about 30 hours later. could it possibly fail?

3 doctors weighed in across 2 answers

Possibly: Plan b is very effective but not 100%. In this situation, the best option is to repeat a pregnancy test if your period does not start when expected and see your doctor to start some form of regular contraception.

Answered 9/24/2017

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Dr. Heidi Fowler answered

Specializes in Psychiatry

Possibly: Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes.

Answered 11/28/2017

535 views

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