Help, is my baby’s NT scan really bad???!!

So I was watching the screen and I saw the measurement of 0.7cm for the back of the neck! I only know it’s suppose to be under 3.5mm so I tried converting that cm number to mm and it comes out as 7mm?!

I’m freaking out!! I haven’t seen the doctor because that appointment isn’t until 2 days. They have low availability due to covid and now I’m nervous