Plan B is an emergency contraceptive pill. It should be taken within 72 hours of having unprotected penis-in-vagina sex. You do not need a prescription.
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You're Screwed If You Wait Too Long to Take Plan B
How Effective Is Plan B? 95% If You Take It Within 24 Hours
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How Long Can You Wait to Take Plan B?
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What happens to your period while taking a plan B on your period? - Quora