Not good thought: process. Plan B One Step is for emergency contraception and should not be used in place of a regular oral contraceptive. You should take as soon as possible after sex. 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.
Answered 9/9/2017
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