Suggest Treatment For Severe Pelvic Pain

I have been experiencing discomfort and heavy ness in my pelvic area. I sit with my lap top on the couch and it is up against my lower pelvis as I recline a bit. Could this cause the pain and if so, can it cause cancer? I have had an ultrasound, blood test and am going in for a pelvic exam next week. I have also been advised to have a CT but another doc told me an MRI is the best test for that area. I am worried I have caused cancer in my bowel or ovaries.