My doctor believes we are good but I’m worried

Ka

I found out I was pregnant sept 10th, right now I’m supposed to be 10 weeks going off my last missed period my doctor thinks dates are just off. I’ve had 4 ultrasounds have seen growth but still haven’t seen heartbeat. My levels were checked last Monday and were 55,553. Today after ultrasound he didn’t think we needed to check levels and wants me to go in for another ultrasound next Wednesday. Anyone else having this happen, nervous and scared and it’s going to be a long 9 days everything I have read I just feel like we should be seeing heartbeat by now 😔