It depends on whether it's on time to stop you ovulating. Do you know where in your cycle you are? Day 1 is the first day of your period.
If it is in time to stop you ovulating, then Plan B is said to be 90% effective if taken within the first 12 hours after unprotected sex.
At its latest point, 72 hours later/3 days, it's said to be around 75% effective.
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