Ultrasound specialist?!

So I just had an ultrasound done today and the midwife was concerned because she said the head and neck indicated a possibility of Down syndrome. But he was also measuring very large. 1.1 pounds. I’m only 21 weeks but measuring at 22. I had bloodwork done and it put him at low risk. Only .01% chance of having it. She thinks it’s probably because he’s big but having me referred to a specialist anyways for them to do a more detailed ultrasound and rule it out.

Has anyone had anything like this happen and everything was fine? She told me not to worry but that’s hard because I’m a worrier lol. It’ll be 2-4 weeks before I get into the specialist and the wait is going to kill me!!!!