Hi, I am a 21 year old female. I have been experience slight pressure sensation in lower left pelvic region for a while (maybe two months). my menstrual cycle was on time and i started to experience severe back stiffness in the same side LLQ, my dr ordered a cbc, pregnancy test, and urinal analysis all which came out normal. He also order an ultrasound which i have not had yet, apt in one week. i am wondering what is the likelihood of ovarian cancer or cysts? and how can they tell the difference. My cramps were worse this month but i have not had "severe" abdominal pain/cramping outside of my period. thank you