Almost 6 weeks after abortion and hcg is at 39

Keegan.
I had an abortion sept 11 at 6 weeks 5 days pregnant . The last reading I had of my hcg 8 days before it was at 22k . I don't have any symptoms of bleeding , fever , or smelly discharge. I had a scan at clinic and the tech said she didn't see anything . Any idea of what's going on. I haven't had sex in this time .please help