My boyfriend and I had sex over the weekend, and earlier this week I started bleeding, but it was brown and, clumpy, and slightly sticky. It has turned now to a more red color, but I'm not supposed to get my period until next week, which is when I start my sugar pills. Is there a reason for this bleeding before my period? Or am I getting my period now? I also am living with 3 other girls, so could my body be thrown off by their hormone levels? Two of them got their periods on Sunday.