Hcg levels not doubling , worried :(

Elisa
Hey! On 8/17/2016 my hcg levels were 5998 then on 8/20/2016 my levels were 12206 and my recent test was just done on 8/24/16 and it was only 16437 :( . I had a miscarriage back in April and I'm scared things aren't going right this time. I have had no bleeding or anything like that just slight cramping which I think is normal. Has anyone had this experience and had a healthy pregnancy? Btw I'm 5 weeks and 6 days