MC? Soo confused

ln
I started spotting brown on Tuesday, July 14. Later that day I got blood drawn for hcg levels, they doubled from the last time.
3 days ago my bleeding turned red and I'm still bleeding.. Not severely but I have to wear a pad. I'm assuming I will MC..
If I was bleeding because of MC should by numbers have dropped? I would assume that once the bleeding starts, my hcg would have dropped
Or do levels drop until everything is out of me?