If you take: plan B with in 24 hrs it is 95% effective , 72 hrs will drop to 89% see your doctor for several available contraceptive measures ,
Answered 11/14/2016
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Low risk: 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. Consider regular use of birth control (such as oral contraceptive) so you don't have to rely on emergency contraceptives.
Answered 11/1/2017
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