HCG help!

Julie

Just wondering if anyone had any insight on these numbers!

9 DPO: 6

12 DPO: 38

14 DPO: 76

16 DPO: 144

20 DPO: 959

22 DPO: 1532

The rise between 20 and 22 is what is making me nervous. OB has my scheduled for 6 week US. All my symptoms disappeared between 16 and 20 DPO. These numbers are so different from my first pregnancy!