I have terrible period cramps and it always hurts when I'm having sex and I cramp for a day or two after having sex. My cousin has it and from the research I've done most doctors believe that it is heriditary. Could I have endometriosis? I can't ask my mom to take me to the doctor because she would tell me it's normal to have bad period cramps and I can't tell her I am having sex because she would ground me.