Hi I am 20 years old and I have had my period since I was eleven years old. I have never expirenced cramping or anything. Recently I have been expirencing cramps and bad pains its hard for me to walk and it hurts for me to eat and my period has came every two weeks or a shorter time before that.I am not on any type of birth control. When I bleed its irregular like clotts and I have been going through several pair of pants a day... what do you think this can be?