How long do
72 Hours | 3 Days
The sooner you take it, the better it works.
Plan B helps prevent pregnancy before it starts by temporarily delaying ovulation when
taken within 72 hours (3 days) after unprotected sex. Wondering whether you’re within
the window to take Plan B? Enter the date and time you had unprotected sex below.
Not sure when exactly you had unprotected sex? Reach out to your healthcare provider
for more help.
RE-CALCULATECare without conditions
“Everyone deserves access to emergency contraception without feeling guilt, fear, or judgment. It should be treated like any other form of healthcare–normal, safe, and empowering.”
Recent Plan B User
Need to find a store?
Shop for Plan B your way: Online for same-day delivery or pickup in-store/curbside. Or
find it in-stores at all major retailers.
What you need to know about Plan B
Plan B is the #1 OB/GYN recommended emergency contraception brand*
*Survey of 1001 OB/GYNs, June 2026
Won’t interfere with your regular birth control, or make it any less effective
Won’t impact your ability
to get pregnant in the future
