I've been getting cramps right after orgasm (from oral w/ vaginal +anal fingering), it goes away after a few minutes. Although, I've also been getting cramps and sometimes a backache even when I'm not doing anything sexual. I'm on the nuvaring, and I don't get periods because of it. The doctor has me use it specifically so that I don't menstruate, because I get very painful cramps. I'm not as worried about the cramps and backache every once in a while, as my doctor thought that could just mean I need to have a period. I looked up endometrios, and thought maybe that could be the problem? I also had an abnormal pap nearly a year ago. I went back and had a different type of pap smear done (they said this one screened for more abnormalities) and it came back normal, so no biopsy was done, but I'm still a bit worried.