How long does it take for the Plan B pill to work?
by 
The Curious Bag
ANSWERS: 1
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The Plan B One-Step tablet works best when taken within the first 24 hours but is effective up to 72 hours after contraceptive failure. The pill takes effect immediately, but its success will remain unknown until the woman's next regularly scheduled period. If you are more than seven days late, take a pregnancy test.
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