Ob-Gyn questions? Ask a gynecologist online.
How tall are you? How much do you weigh? Any weight change? Any symptoms? Any medical problem? Any surgeries? Any other medications including over-the-counter pills and herbs? Any family medical history?
You could have endometrial hyperplasia (increased lining of the uterus, benign) or fibroids. You should see a gyn to have ultrasound and an endometrial biopsy if the lining is thick.
You are welcome. Take care.