I know exactly what you are going through. I had my first trimester screening last Monday. They told me the ultrasound looked fantastic. Two days later I received a call from my doctor and she said my blood results weren't so great. I have low Papp A and HCG levels (proteins for placenta) That and due to the fact that I'm 38 they told me I have a 1 in 16 chance of having a baby with trisomy 13 or 18. Needless to say, I was devastated when I got the news. On Monday we go for genetic counseling and a CVS test. I'm scared to death and can't imagine waiting on the results. They tell me it takes 10 days after the test is performed to get results. I just keep hoping the screening was wrong. Good luck...I am thinking about you.