I got my period on the 16th and it ended on the 21st, a regular period. And today I noticed bleeding, not spotting, I was wondering if I am starting my period again. And if so why? I am not stressed out ,neither has changed in my diet, just mild exercising which I do every now and then. I am sexually active, and I did take a ept three weeks ago, it was a month away from expiring but that shouldn't affect anything. Could my period just be readjusting?

Readjusting to what? Were you on b.c. and stopped? If so, it's common to have unusual symptoms for a month or two.

If you took an Emergency Contraceptive, than it could your body figuring out and adjusting to the hormone rush you got from the PlanB. What are you using for birth control? Is it just the Emergency Contraceptive? Might be time to investigate alternatives.