How long does the plan b morning after pills effectiveness last in your body?
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Lasting Effects of Morning After Pill

It is NOT known how long the morning after pill aka Emergency contraception aka Plan B works. but perhaps 1 day?

NOT 120 hrs. 120hrs is how long you theoretically could use EC after an accident BUT once the egg/sperm hook up, it's over and it does NOT work. if you have an accident, take EC as soon as possible because you don't know when that woman is going to pop out her egg and once that happens you canNOT prevent pregnancy with EC pretty much.

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