Worried!!

Does anybody think my baby has a lot of fluid behind it’s head?? At my scan nothing was mentioned, they said that they was happy with everything and it’s a low risk pregnancy? (12 weeks 1 day) I just know a lot of fluid behind the neck can mean Down syndrome? I’ve had blood test to check the chances of baby having Edwards, patau and down syndrome, they should come back this week but I can’t help but worry😩 help?!