I take Sprintec 28 day and ive been on it for 4 months now. Usually on the 3rd placebo day i get my cycle. This month my cycle ended by the 6th day. Me forgetting that i didnt get my new pack had unprotected sex that Sunday, Monday and Tuesday. However on Tuesday i had blood in my underwear (something that has never happened to me outside of my mentrual cycle) in the morning, however didnt bleed for the rest of the day. So for fear of going too long without my pill i started it Wednesday instead of waiting until Sunday. And soon about to get back up birth control. Could i be pregnant??