I have always had irregular periods. Up until july 2016 it would be one every 6 to 9 months. Then it started to become more regular at about every 35 days. Over the last 6 weeks i have had bleeding 3 separate times. The first felt like a normal period sore breasts the week before lasted about 5 days. The next about 2 weeks later just started heavy out of no where for about 4 days no cramps or breast tenderness. That cycle ended about a week ago maybe 6 days and today i am having pinkish brown bleeding but it is lighter and am experiening cramping. Not sure what could cause this?