I'm 17, turning 18 In a month and a half. I've never got much information on these two. I was diagnosed and had a laparoscopy don last year for my endometriosis. My last period I had almost lasted 3 weeks! But the last week was light. I HAVNT had my period this month, but I also had a knee surgery 4 weeks ago and finals. I've takin' two pregnancy tests when I was about 3-4 days late and they were negative. Thank The Lord. My mom had me at 17. My periods are usually SOMEWHAT normal but I didn't know if my 3 week flow messed my whole body up. I feel the cramps in my back and abdominal area, my period just isn't here!!!