thickness of the uterus?

i am a 41 yr old premenopausle female. I go in yearly for my gyn exam i went on monday during the pelvic exam my gyn said he found something. I had a vaginal ultrasound done and the tech told me that she didnt see anything that would cause me to lose sleep over. I go in the next day for follow up with my dr he tells me that i have thickness of the uterus. Asked me about my period where they heavy I never thought they were heavy. Some background on that would i have a normal cycle no spotting in between my cycles. Cycle last less than a week and during the first 2-3 days i will have to change the pad maybe 2-3 times daily. Sometimes during those first 2 days i will have a feeling when i stand up of fluid coming out be nothing to bad. I have no other sympotons to speak of I told my dr this and he wanted me to have a hypertospy d&c i asked what would could cause this he said hormonal, cysts or uterine cancer. Well i am terrified of the "C" word. Can you give me any help.