Im 18 and I'm just a little concerned and have questions. I have an uncommon cycle and symptoms of endometriosis like for instance when if I don't have birth control I will bleed for weeks, and when I finally do stop my period I can have sex and it will open the floor gate and I will be on it again for another couple of weeks.. That is a concern. Why do I keep bleeding? And also what are the chances I could be pregnant if I missed my due date for my shot a couple of weeks and had unprotected sex with out pulling out... It sounds high but I was basically on my period. And now Ive stopped could I be prepregnant please help without judgement