I am on birth control pills (Loestrin) which have 24 days of active pills and 4 days of inactive pills. I am supposed to start my period on the first day of inactive pills but I almost always have breakthrough bleeding on the last day of the active pills and definitely always start my period by the first inactive pill day. I am two days late now and have not had any bleeding at all. I had some crampling last night and thought I would start but never did. I took a pregnancy test but it was negative. What is happening? Could it be too early for the test to tell if I am pregnant? I am very regular and can't figure out why I am late. Help!