An ultrasound of my uterus showed my uterus is large10.8x4.2x5.5 and endometrial lining was 9.0 mm and a simple cyst in my right ovary is this normal?

Most likely. The of the uterus is influenced by many factors which include children. Fibroids also can enlarge the uterus. The 9 mm thickness is still within a normal range assume of course you still get your period and where you are in the cycle. Ovarian cysts are very common.