My periods been pretty normal, the past couple months except the last 2 months i was 2 days late. EACH MONTH my periods are 35 days and i have extremely bad PMS. I started my period 11/3/2013 and it last about 5 days. I then again started bleeding on the 23rd this time no cramps no pain . Only mild backpain . I bleed for 7 days getting off today. I dont know whats going on. Currently im having lower back pain. Me and my boyfriend are sexyally active, but pregnancy is my last concern , im afraid something might be wrong.