please help hcg

Erica
According to my glow i was 5 weeks 3 days on 9-10-2016 and my hcg then was at 495
I had another BT on 9-13-2016 which made me 5 weeks 6 days and my hcg was at 715  can that be a normal thing or should i prepare to miscarry again? Im so scared