結果 : how long do plan b's work
2:46

The Science of 'Plan B' - Emergency Contraception

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HOW DOES EMERGENCY CONTRACEPTION LIKE PLAN B WORK? MORNING AFTER PILL

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Fact Check: Plan B Does Not Terminate Pregnancies

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How does morning after pill work? – 3D animation

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How Do Birth Control Pills Work?

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1:00

Some national pharmacies are limiting how many emergency contraceptive pills people can purchase.

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