I am in sc, and, first of all (at least here), the blood test for downs isn't even required. My doc told me he is required to offer it but the patients are not required to take it. He also told me that, a lot of the time, when the test indicates something is wrong, the baby ends up being perfectly healthy, anyway.
The blood test is not accurate at all. Neither is the amnio. I took the blood test but wished I hadn't even before I got the results. I told my bf that I had no intention of getting an amnio and that it didn't matter, anyway, because even if the baby did have problems, I wasn't going to terminate or anything like that. In my opinion, it just causes undue stress.
Congrats on the pregnancy and good luck!