Down syndrome ultrasound ??

I got a call from my doctors office on Monday saying my doctor wants to see me in. I wasn’t due for another prenatal appointment for 2 weeks. This is my third baby & I was trying to look at my other children’s ultrasound to see if I could see anything concerning. I did notice it looks like this baby has more fluid behind the neck/back area. Idk if I’m right but I’m worried!

13 weeks.