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What are the chances of the Plan B pill not working?

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So it will not work if you are already pregnant when you take it. ... If you take it within 72 hours after you've had unprotected sex, Plan B One-Step can reduce the risk of pregnancy by up to 89%. ... Remember: Plan B One-Step will not protect you from getting pregnant if you have sex after taking the pills. read more

Plan B One-Step works like other birth control pills to prevent pregnancy. The drug acts primarily by stopping the release of an egg from the ovary. It may prevent a sperm from fertilizing the egg. read more

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Plan B one-step emergency contraceptive 1ct. | Rite Aid
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