I'm 55 years of age and menopausal. Last week I had an vagibal ultrasound showing endometrial thickness of 18 mm. My ovaries were normal. Just 7 months ago I had a vaginal ultrasound and it was normal with my endometrium 2.9mm. I was on birth control pills at that time and have been taking them for over 10 years. I have no vaginal bleeding or discomfort. I started Prempro last month for a month, but stopped due to symptoms of bloatness and weight gain. I am scheduled for a D&C next week, but I am very apprehensive and concerned if this is cancer. In such a short time, how can I have developed this endometrial thickness? Could it be a fibroid or polyps?