Ive been on birth control for 5 months now, the first 3 months I had no problem as I got my period on the week of the sugar pills. But, the last two months I've gotten my period a week before my sugar pills. I haven't missed a pill or taken any late. Why am I getting my period early? Is this break through bleeding? Do I need a higher dose of hormones in my pill? I take Ortho Tri-Cyclen.