Doc stressing me out

Went over my 20 week ultrasound today - Dr mentioned finding something about the heart, but he rattled the name off so fast that I didn't catch it. He did say that he thinks it was just baby's positioning (I had to do jumping jacks at the ultrasound in hopes he'd start cooperating 😂)  and that, as a low risk patient, I shouldn't worry. My next appointment was scheduled normally at 4 weeks out. Now I'm stressed, trying to google what he could have possibly said, and kinda irritated he mentioned it at all if it's truly nbd. 😤 /rant