Low rising HCG and low progesterone

I had my levels checked one week apart and they were 1,480 at 6 weeks and now 3,885 at 7 weeks. This is half of the lowest number in the normal range. And my progesterone went from 9.1 to 9.4 which is also low.

I have to go back for the 48 hour test tomorrow to check again. I’m worried about an ectopic pregnancy and wondering if anyone has experienced low rising numbers that were well below average or if anyone had a transvaginal ultrasound to check on it? The nurse said they wouldn’t be able to see anything yet....