Hi C.,
I went through this exact thing, with my baby, so I know how you feel. The blood work is a screening test. When I had the test done, it showed that there was protein in mine and my baby's blood, which was an indicator of a slight risk of my baby having Down Syndrome. I had a level 2 ultrasound done at 19 weeks. The test looks for what they call "soft markers" to determine if the baby may have DS by measuring the head, legs, arms, etc. After one hour of watching my baby kick, punch, smile, and hiccup, the doctor assured me that my baby was perfect. She is now 9 months old today, and I am happy to say that she is perfectly normal, healthy, and beautiful. :) Don't worry hon. I know how the anxiety feels thinking there may be something wrong with your baby. I was there, and so was my best friend (her baby girl is healthy and normal too). The test is just a screening, and does not mean, in any way, that your baby has Down Syndrome. The only real way they can determine that is through an amniocentesis. That test, however, has a risk of losing your baby. So just breathe. Everything will be okay. And if your baby does have Down Syndrome, I believe that God does not give you more than you can't handle. It will all be alright, you'll see. :)
D.