HCG levels rising but...

I know everyone is sick of hearing about Hcg levels and the questions and ect but when you've had losses (2 in a row) it makes you worry more. 

So when I was 5 weeks 3 days I had my first level drawn on Monday June 26th it was 971. Then I had another level done on Friday June 30th (6 weeks) it was 2,021. Then Monday (6 weeks 3 days) July 3rd I had another draw it was 3,429. So their rising but my levels are either taking longer to double or like the last draw was 613 from doubling. I see my OBGYN tomorrow but am just all sorts of worried and scared that our rainbow baby may not become our take home baby. So have any of you ladies experienced this and if so what was the outcome? Thanks for your understanding and respounces.