I'm almost done with my 6th pack of sprintec 28 birth control pills. During the 5th and 6th cycle, I have had breakthrough bleeding. Both months the bleeding has come during the beginning of the second week of active pills. The bleeding is usually the brown blood like I'm about to begin or finish my period. It will last about ten days with a few days of normal blood. I take my pills on time, but I was wondering if I should go to my doctor now or wait another month to see if it gets better?