NT scan

Hi, does anyone have any insight on NT scan? I went in for my 12weeks scan (not NT) and the technician kept measuring and taking photos on the back of baby’s neck, then asked me if my dr has mentioned the NT scan, she has and we were going to do the 16week blood test. I asked the technician if she seen a problem she said: no, that’s something your dr will talk to you about. So now I am freaking out. Does anyone have any NT scan images that are positive or negative they would like to share, so I can have a bit of an insight. Thankyou