Plan B® is an emergency contraceptive that can be taken up to 72 hours after unprotected sex. But the sooner you take it, the more effective it is.
Plan B One-step Emergency Contraceptive : Target
Plan B in People With Overweight: Is it Effective? - GoodRx
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How Plan B and other emergency contraception work and how effective they are : Shots - Health News : NPR
Will Plan B work after I had sex? I took Plan B this morning and then had sex an hour later. Will I have to buy another one? - Quora
I took a plan B pill two days before ovulation. Is there a chance of pregnancy? - Quora
How Long Do Plan B Side Effects Last? What To Expect
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How Does Plan B Work?
How Does Plan B Affect Your Body? – GMPC Medical