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Use contraception. When you're on your period, you're at higher risk for STDs and pelvic infections. What's more, you're less likely to get pregnant, sure, but it's not impossible. So if you thought this was your ticket to ride, sorry -- you still gotta stay safe.
Side effects vs STI: Some women notice that their periods are off in timing +/- 2 days after taking Plan B. It is often the next month's period that is heavier or longer, not the current one. In your case, I suspect you had unprotected sex (hence the need for Plan B) and may be experiencing pain from a pelvic infection/ STI. You need to see a physician for STI testing and treatment. ...Read more.