All your questions about having sex after taking plan b answered it can help prevent pregnancy after sex, but before is a different story. It contains levonorgestrel, a hormone that works primarily by delaying ovulation If taken before ovulation, it can prevent the release of an egg from the ovary You don't, however, have to wait until the morning after sex to. 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.
Does that make it less effective Plan b is an emergency contraceptive pill You do not need a prescription. It works best if you take it within three days, or 72 hours. Plan b (levonorgestrel) can prevent pregnancy up to 72 hours after unprotected sex, but it is best to take it as soon as possible Plan b works by delaying ovulation, but it is less effective after ovulation or in obese women.
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