Hi i am 17 and got my first period at 13. For almost 4 years i had regular periods that were every month (give or take a few days) and 5 days in length every time. (I monitor them with an app.) i have a pretty regular flow that isn t really heavy and have never been sexually active. But the past 6-8 months have been really irregular. One month i didn t have my period and this past month i have had 3. Every couple times i get my period i suffer EXTREMELY painful cramps that make my incapable of motion and sometimes physically ill. i get cramps on regular periods but sometimes they hurt substantially worse than others. Do you have any idea what is going on or what condition i have because I m pretty sure this isn t normal.