Ive been on birth control for 7 years, a year ago I switched to sprintec lo. I had break through bleeding in May that lasted for 3 days. Its happened twice this month for about 3 days each time. Is this normal? Ive never had it happen until now and was diagnosed a year ago with PCOS and am on medication for it as well. I am not supposed to start my period for another 5 days and took 2 pregnancy tests a week apart, both came back negative. My OBGYN wont be able to see me until September so Im hoping you guys might be able to help me out!