Extra fluid behind baby’s neck

I went in for my ultra sound today. I am 10 weeks and 5 days, baby is measuring 11weeks 2 days. Baby’s heart rate is 167. I thought everything looks good as baby was very active. When we saw our doctor he said the baby had extra fluid behind the neck (measuring 5.8) which could be a sign of turners syndrome. I had blood test done today to see if the baby is ok or not but we won’t know the results for two weeks. Has anyone had a similar case or could anyone give me any advice. This is my third baby and I’m freaking out. Thank you.