I Am 54 Years Old And Menopausal. However I Am

I am 54 years old and menopausal. However I am bleeding and the doctor ordered a ultrasound and found some fibroids. We then had a endometrial biopsy that came back benign. A month and a half later I began bleeding and called the DRs. office to report this. I was told by the doctors nurse he wants to perform another endometrial biopsy. Why and what if I get the same result (benign)?Then what?