Do I Have Endometriosis? What is Wrong With Me?

I'm 19, female, never had kids, I've been on birth control since May 2013. I was on Microgestin Fe 1/20. Less than a month ago, my OBGYN put my on Reclipsen 1/30.
Since January 2014, I've been experiencing pain in my lower left side of my hip/pelvis. Recently, the pain has been moving to my right side as well. I've had all of my bloodwork done, CT scan, Pap, and all of it came back normal. No, I'm not pregnant. I have not had a period since November 12th, 2013.
The OBGYN said that if I don't have a period within the next two months and if the pain persists, then I'll have to undergo laparoscopic surgery. What's wrong with me? Has this happened to anyone else?
Do I Have Endometriosis? What is Wrong With Me?
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