hcg levels

brittney

my hcg when I found out I was pregnant was at a 1300 then went down to a 600 then I test again and it was a 900 so like 3 days after I started bleeding. I bled for 10 days. I'm on day 3 of no bleeding do I'm guessing a miscarriage so went to do blood work again and the levels went up to 1900. I took a pregnancy test today and it came back positive with dark lines , if I had a miscarriage shouldn't the line be light and shouldn't my levels be almost at 0