I Am 64 Years Old And Did Not Stop My

I am 64 years old and did not stop my cycle until I was 60. I have not been bleeding but I have been very bloated. I had an ultrasound and a trans vaginal ultrasound and the result being that my ovaries were normal but the endometrium was 9mm. I now need to make an appointment for a biopsy of my uterus. what is wrong