Today’s ultrasound results weren’t the best 😔

I figured we’d go in for our 20 week scan and everything would be fine but unfortunately that wasn’t the case. I’m having to get a level 2 ultrasound because they couldn’t see the 4 chambers of his heart. They said it could be nothing it could just be because their ultrasound machine is older and isn’t the best quality. They also made me get genetic testing done. I’m so scared that somethings wrong with my baby boy. Has anyone else had this problem and it turn out to be nothing? The doctor didn’t seem too concerned but I can’t help but think the worst.