With your past history and the mode of presentation you have at present, pregnancy
needs to be excluded if you are sexually active without any contraception
. I would suggest you to get a serum beta-hCG assay followed by a pelvic/trans-vaginal sonogram. If no pregnancy is detected, you have to rule out other causes like hormonal
disturbances, local lesions, infection, weight disturbances and stress
. Please see your consultant and get the needful done. Take care.