Hgc levels! After misscarrage

I went to the doctor and she said I was in the early stage of misscarrage, cause she didn't see anything on the ultsound. So she gave me a pill to help the misscarrage alone... well it's been about 3 weeks now and my hgc level have double... it's honestly exactly where there would be if I was 5 weeks. They are thinking I have gtc. But the cat scan showed nothing in my chest... Cause she said that's where it would first start at. But anywho... I'm spotting I have been since September 30. The day I found out I was pregnant. .... what to do? They are wanting me to go to and cancer center... anyone have this problem?