Am I having a miscarriage?

I have been bleeding/brown spotting from 5 weeks. Doctors weren’t worried. I’m currently 7.4 weeks pregnant had my dating scan today and the lady said she couldn’t see any signs of pregnancy? I’m confused.

My hcg levels were 54 then few weeks later 800. 3 positive tests. Going to see my doctor today for bloods. 🙁☹️😢