Amnio testing in pregnancy for Downs Syndrome? Help?

I am 18 weeks pregnant, and have had to schedule an amnio because my NT scan was problematic. My doctor said normal NT results are 1.0 and mine was 2.4 signaling that my baby is at an increased risk for Downs Syndrome. Has anyone else recieved a result like this? Did you go on to the Amnio and what were the results like? If you have already had your baby, did everything turn out ok? Thanks in advance for your responses.