Im 41, premenopausal reg.periods but recently began having very heavy bleeding for weeks at time. bloodwork & hormones normal. had ultrasound. us showed two small fibroids and endometrium lining of 22mm. going for biopsy. likelihood of cancer ?

At age 41, it takes more ovarian stimulation, leading to delays in ovulation and delays in true menstruation. The higher levels of estrogen stimulate additional growth of endometrium, hence the thickness of "22 mm", and spontaneous disintegration of the endometrium, with heavier bleeding/clots as a result. The biopsy is indicated, but uterine cancer is unlikely.