For example, the chances of pregnancy are higher if plan b is taken 4 days after unprotected sex, but are subsequently lowered if taken 3 days, 2 days, 1 day or within 24 hours after unprotected sex. Plan b can be taken within 72 hours (3 days) after unprotected sex Use our countdown calculator to find out if you're within the window to take plan b. Plan b should be taken as soon as possible after unprotected sex, ideally within 72 hours for maximum effectiveness. You do not have to wait until the morning after having unprotected sex to take plan b You should take it as soon as possible, since the sooner you take it, the better it works
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