HCG 6 weeks

Is 36,000 at 6.5 weeks okay? My doc hasn’t interrupted results yet and I’m having so much anxiety. :)

My levels were:

4 weeks-760

5 weeks-4,000

6 weeks-36,000

Is it true that HCG stops doubling every 48 hours and it doubles every 96 hours around 5 weeks?

Thanks in advance!