I have had my dark blood, which I believe to be my period. It has been going on for 5 days now and still remains unchanged. Barely any blood, and really only occurs when I wipe. But I have been using a tampon, which usually ends up with barely anything on it. What is going on? Im 5'9 157 lbs..my period is always "flowing" and always makes it self known, but not this month.