Plan B is a huge dose of artificial hormone for your body to deal with. If you're not pregnant (& women can seemingly have a period & still be pregnant), then it could be your body still readjusting.
Do a test to rule out pregnancy, & assuming you aren't sick with any other cause, it's likely to be the Plan B.
If you get worse, see your doctor.
- Plan B Information for Consumers
- Plan B Information for Healthcare Professionals (includes dosage details)
- Side Effects of Plan B (detailed)
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