this is something i noticed a few years ago much it has become much worse lately. when i go running, once i get about a mile into the run i start noticing cramps very similar to period cramps and they are very intense and painful. once i stop running it gets even worse and i need to either crouch down or all together sit on the ground. its more painful than any period cramp ive ever had. then after 10-15 minutes it pretty much goes away. sometimes i even notice if i go to the bathroom after that there is a very tiny amount of blood. its incredibly strange and happens at all times during my cycle. has anyone else experienced this???? also i'm an 18 year old college athlete.