Post Menopause and bleeding

Hello! A little background...back in Oct. 2014 I had the Mirena IUD removed. I then went one year without any birth control or hormones. I did not have a period during that year. I then went to an endocrinologist since my OB/GYN suggested it. He put me on HRT. After a while I knew something was wrong so I went to an OB/GYN who specializes in bio-identical HRT. In running tests she discovered I had been given way to much in the dosing of my hormones. She was able to get me back on track and I continued with the bio-identical HRT for about three years. Then I learned I should not be taking it since I have polycystic kidney and liver disease so I stopped taking it in July 2019. All during this time (since Oct 2014) I never had a period and wasn't on any birth control. Because of that, it was deemed I was post menopause. Last night I started bleeding. I am seeing an OB/GYN on the 11th to have an exam done. I have them annually and there wasn't anything unusual last year. I'm at a loss with all of this. I turn 44 in July. Is there anyway possible that I'm not post menopause and for whatever reason, didn't have periods until now? I imagine that's not possible and in doing research, I know the list of possibilities for this bleeding. Some scary, like cancer (no family history of it). Anyway, any insight/thoughts are appreciated!