Questions about birth control

Hello ladies, I have been on Sprintec for about 7 months, I always allow myself to have a period, I do have PCOS, anyways, I've been on Sprintec for 7 months and the last two months I have started my period before it's time to start the inactive pills. It starts 2-3 days before the inactive pills begin and will last all the way til the start of the new pack. I've also noticed I have EWCM as if I'm ovulating. The amount varies but it's always there. Does anyone know what could be going on?