I am 39 years old and have always had very regular cycles. But in the past 3 months, I am having 2 and sometimes 3 cycles a month. I am currently bleeding and my last cycle was 12 days ago. It always starts with a dark brown blood and then after about a day, turns to bright red. I am in no pain and it completely catches me off guard because I don't show my normal pre-mentrual signs. I am not pregnant and I am not on any medication and I am not under any unusual amount of stress. Just concerned about this abnormality. Can anyone shed some light on this...