So I had sex with a guy and we used a condom but it slipped off and therefore as a precaution I took plan b. Within a week and a half we had sex again without a condom and I took plan b again. Then within a couple of days I had brownish discharge, and then it continued to bleed heavier and now it’s like I’m on my period. But I’m not supposed to have my period for another 2 weeks. Is this normal? 

My last period was the 28th, and I’ve been bleeding for around 4-5 days now. And my period is supposed to start on the 27th but it’s usually normal for my period to come nearly. Any clarifications? 2 periods within a month?