Plan B is a backup option that helps prevent pregnancy before it starts. It must be taken within 72-hours after unprotected sex or birth control failure. The sooner you take it, the better it works.
Some women taking Plan B One‑Step may have changes in their period, such as spotting or bleeding before their next period. If your period is more than a week late, it’s possible you might be pregnant. Get a pregnancy test and follow up with your healthcare professional.
If you vomit within 2 hours of taking Plan B, talk to your healthcare professional to find out if you should repeat the dose.