HGC Level. After A miscarriage

Samantha
Has anyone had this issu?IGot a positive pregnant test Sept 29 . went to the Dr they didn't see anything in the u/s. my dr said LOOKS like early stage of a miscarriage. So She gave me a pill to finish it out. Well about a week from that i spotted a little more and clear sticky stuff appeared. Well I have been spotting since Sept. (Brownish pinkish a little red) not no period though. My HGC Levels have Went up to like 18,000 that Was tues of last Week. ME and Josh my husband pin point that I would probably be 5 weeks now. They didn't see anything in my tubs or area. But I have high hgc levels. My dr. Thinks it's a tumor gtn. I talk to a few ppl who had it and there stories are nothing knew mine. I plan on getting a second opinion by another dr. I'm so confused. I'dk what's going on. My doctor is trying to send me to a cancer center when my cat scan came back negative. I'm thinking she has no clue what is going on with me. I'm worried... so if anyone had this. Or any idea... that will be great to tell me about it or how to go about it.