Hi, welcome to HCM.
Endometrium is part of uterus
which is getting affected in menses or bleeding. its thickness is depending on day of menses or age of patient. In your case you didn't mention your age. Also uterus is slightly bulky.
If you are postmenopausal then it is highly significant. Also your uterus is slightly bulky. I will suggest please consult your gynaecologist for further management.
Hope I have answered your query.