Ultrasound Says Thick Uterine Lining,provera Prescribed

The nurse practioner said I have thick uterine lining,and says that's a risk for cancer. She told me after my period,to have another ultrasound. Since I havent had one this month,mine are usually so light now,thought since iwas 47,and obese,that it was normal,and that I was premenoupausal. She said to take provera, for 10 days,and I would bleed heavilty,and then when I was done call and they would set up another appointment. Does this sound right,shouldn't I have another test,or biopsy. I did have fibroids,and heavy periods,but that quit about 3 years ago,and now the fibroids have shrunk. I am scared,and want to know what to do.