Worrying myself.. Down syndrome?

So to start off, my babygirl was negative for any type of chromosomal defects according to the NIPT test results. But a week after my 3D/4D scan at 31 weeks, I had a dream I gave birth to a baby with Down Syndrome. (I will love her either way) and now I can’t stop thinking about it and I’ve been googling so many things.. I read about something called Nuchal Translucency which is like the area behind the head/neck and it has fluid in it and appears thicker than normal and it’s a possible sign of DS? I started looking at pictures and I’ve worried myself. This picture the arrow is pointing to her hair and then circled area seems thicker than what I’ve seen in other peoples ultrasounds. Is this the Nuchal Translucency I read about? Am I worrying myself or does it seem kind of thicker? Does her head seem large? Ugh they haven’t told me anything is wrong but I can’t stop worrying myself to death.