HCG levels

I am 6 weeks exactly.

I have been having off and on spotting so on the 21st I went in and my levels were 1,130.0

4 days later ( today ) it’s 2,794.0

Does that seem about normal? They told me to come back in again in 48 hours and when they did the ultrasound they wouldn’t show me anything and they just keep telling me I should be OK but they’re not really easing my mind like I thought they would.