HCG levels around 4 weeks (Are these too low? So worried)

Hi everyone 💗

I got my HCG levels checked on the 14th, the results showed they were 568 (4 weeks 3 days) , I then went back in 48 hours on the 16th (yesterday, 4 weeks 5 days) to check them again and it was only 630. Is this too low? Should I be worried about my increase? I am worried because I did miscarry previously in April and I’m not too certain if these numbers are good.