Okay so I've been on birth control for 4 months now. I've never missed on and I take it correctly ever day at the same time. My boyfriend ALWAYS wears a condom. We had intercourse a week and a half ago. When I was supposed to get my period this Monday, it was extremely light and dark brown just spots of it at a time. Now I'm starting to get little clumps. But no actual flow. I took a home test and it was negative. I'm really scared and I don't want to be pregnant. Help?