Will Plan B Make You Bleed?

It's not common, but Plan B can lead to unexpected spotting and bleeding. According to the package insert, Plan B can cause other changes to your period, such as heavier or lighter bleeding or getting your period earlier or later than normal.

How soon after taking Plan B do you bleed?

After you've taken Plan B®, you should get your next period at the expected time, or a few days early or late. You may experience spotting a few days after taking Plan B®, but this is not your period.

How do you know if Plan B worked?

The only way to know if Plan B has prevented pregnancy is to wait for your next period. If your period arrives more than a week late, you may want to consider taking a pregnancy test. Some women will experience light bleeding after taking Plan B and may take this as a sign that it's worked to prevent pregnancy.