Hi ! Good morning. i am Dr shareef answering your query. If you are sexually active, it could be due to an unsuspected pregnancy. I would urge you to show yourself to a gynaecologist for a clinical examination and related investigations like a serum HCG and an ultrasound of abdomen to rule out any other pelvic pathology for your symptoms. It might not be possible to opine further over the net without a physical examination and reports of the investigations. I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts. Thanks for choosing health care magic to clear doubts on your health problems. Wishing you an early recovery. Dr Shareef.