D.M.
I agree, talk with your doctor. My daughter was born when I was 36... her neck measured outside of the normal width early on too. Later blood tests (never had an amnio) showed very low odds of Downs. She was born without downs. I remember being FREAKED out by all the tests they wanted me to take since I was (over 35!!!).... I/we decided we would love and raise the baby no matter what... so the tests really didn't matter (therefore I stopped them and didn't have an amnio). I know it's hard not to worry and you want it all to be perfect, but try not to get too upset. Enjoy your pregnancy, it's a magical time : )