nuchal thickness at anatomy scan

I had my anatomy scan at 19w2d. The baby was lying down and they didn't get good enough pictures of the heart so they said I'd have to come in for a second one. I had the cell free DNA screening early on and found out she was a girl. That was reconfirmed at my ultrasound. Also, in my bloodwork, they said she didn't show signs of any abnormalities for trisomies etc. Well, yesterday my dr called me with the follow-up for the appointment & said everything looked good, except yes, they want me to go back and get better heart pictures and her nuchal was thicker which can be an indicator of Down syndrome. I am so scared & sad, it hit me like a ton of bricks. After the bloodwork, I assumed everything was good. But, now I'm freaking out! Has anyone experienced something similar?? Looking for help & support 😥