You don't, however, have to wait until the morning after sex to. You can buy it over the counter at drugstores, pharmacies, or planned parenthood health centers. Yes, you can take plan b immediately after sex, as it is most effective when taken as soon as possible. Plan b one‑step is an fda‑approved emergency contraception pill that you take within 72‑hours after unprotected sex The sooner you take it, the better it works.
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