HCG levels

Au

For all my September ladies that are getting beta hcgs done I want to know if this sounds like my levels are rising alright. So at 3 weeks 5 days I got my first beta drawn due to previous miscarriage and I was having bleeding. First beta was 171mIU/mL. Second beta was drawn at 4 weeks 5 days and was 1215mIU/mL. I feel like it’s not rising enough. Doctor isn’t concerned but I’m on edge. I don’t want to experience another loss.