Does Plan B work right away?
The sooner you take Plan B®, the more effective it is. It can prevent pregnancy if taken within 72 hours and preferably within 12 hours of unprotected sex. If you take it within 24 hours of unprotected sex, it is 95% effective.
How do you know if Plan B actually worked?
The only way to know if the morning after pill has been effective at preventing pregnancy is if your next period arrives when it should. The morning after pill works by delaying ovulation so that you don’t release an egg for remaining sperm in your system to fertilize.
How long should you wait before taking Plan B?
Plan B One-Step should be taken within 72 hours of unprotected intercourse. When taken within 72 hours, it decreases the chance of getting pregnant by 89%. It’s even more effective when taken within 24 hours. Effectiveness decreases the longer a woman waits to take it.
How long does Plan B last after you take it?
“plan b” can stay in your system for up to five days, though it is not effective after three days max. If you have taken it, anticipate an irregular period afterwards. This is typical.
What should I expect after taking Plan B?
Plan B’s most common side effect is that it may change your next period – your period could be up to a week early or late, heavier or lighter than usual, and you may see some spotting between taking Plan B and your next period. Other potential side effects include nausea (and occasionally vomiting), cramps, headache, dizziness, and tender breasts.
How effective is Plan B if taken right after?
Plan B. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes.