3rd trimester ultrasound

Any ladies in the US having an ultrasound around 32-34 weeks? My ultrasound tech mentioned it at my 20 week scan and I didn’t think anything of it,I just assumed it was routine. Now it seems as though not many people do have a 3rd scab unless something is wrong, so now I’m worried.

My doctor has not mentioned anything being out of the norm in my pregnancy so I’m not sure what to think. Thankfully I have an appointment in the morning to hopefully get peace of mind.. but anyone have input?