2nd period this month?!?

I had sex with my boyfriend the 4th of this month which was our second time and started my period the 5th (as scheduled practically) and ended around the 12th, then I started getting cramps earlier today and I've started again. What's wrong? I don't think I'm pregnant so I don't think I'd be having a miscarriage. I do take birth control though and have missed about 4 days so far this month, could that be the reason? I mean I've had abnormal periods before the birth control, but not two in the same month this close together. It's too late to go to the doctor and ask, so if anyone has had the same problem and knows what it is please tell me!

2011-04-22T13:47:01Z

Edit after the two first comments: I took my BC the morning after sex and he wore a condom.
Yes actually I had took a week ago or almost two weeks ago a new anti-depressant med, but only once this month and stopped and kept taking my regular anti depressant med. I don't think that caused it.

?2011-04-22T12:55:07Z

Favorite Answer

It probably is from missing your pills but do you know what else that means? It means you were not protected like you should so you could be pregnant. Stop your pills and go to your obgyn.

?2011-04-22T20:03:27Z

I am on my period more often than i'm not, and it SUCKS. Are you taking any other medication or ills since you've been on birth control? Because sometimes, while on BC, some medications can backfire the BC. It could be a miscarriage, but it could also be just an irregular menstrual cycle caused by the birth control that didn't work.