Down syndrome screening yes or no?

anna
How many of you are opting to take the Down syndrome screening? The fact of false positives scare me. I took it with my first son, but I'm hesistant to take it with this baby. Anyone thoughts if they are or aren't taking it? 
And how many weeks along did you take the test? I cannot for the life of me remember how far I was with my last pregnancy when I took it