Hcg up then down?

Ariana

My hcg has been what I feel slowly rising up. My dr hasn’t seemed too worried about the slow rising until now. I had labs done a couple of days ago and my levels were 225. I went back today to have more labs done and my levels dropped to 87. My dr thinks I’m going to miscarry but wants me to go in for more lab work next week. Is it possible for my levels to go back up? Has this happened to anyone and had a normal healthy pregnancy?