Cycle 5/11 AF due 6/8

I was on birth control the end of April and then stopped 5/3 I took 3 (normal)pills into May and already had my period for that month I then had another period 5/11 and ended 5/15 and I'm suppose to get AF 6/8 tried pregnancy tests all negative. I originally started birth control because of cramping and heavy periods, my cycles were regular. Now I'm not sure what to do. I have little cramping nothing like period cramping. Back soreness which is normal.