Would Plan B Cause Spotting?

You may experience spotting a few days after taking Plan B®, but this is not your period. While you're waiting for your next period, abstain from having unprotected intercourse or make sure to use a contraceptive.

Does spotting after Plan B mean it worked?

Could I be pregnant? Some spotting after using Plan B is harmless. It shouldn't be taken as a sure sign that you're not pregnant, though. Implantation spotting can happen when a fertilized egg attaches to the lining of the uterus.

How long do you spot after Plan B?

Bleeding can start and stop any time in the first three weeks after taking Plan B. The length of your bleeding can vary, but it generally won't last longer than a few days.