hcg 17.9 but bleeding!

Jennifer
Help! I got a faint positive yesterday and my dr did a hcg level test on me and my level was at 17.9 but I've been bleeding all day today and brown discharge two days prior. I'm going in again for another hcg test  in the morning. Has anyone else ever had this happen? I've had two early miscarriages in the past and I'm just praying this is a healthy baby!