Getting the Down syndrome test

I've decided to get the Down syndrome test, I'm 12 weeks so I know I have to get it soon. Anyone know what the test is called? I'll be 13-14 weeks when we get the ultrasound (most likely, it's not scheduled yet) do you think that if they could tell if it's a boy or girl that they would tell us? I'm alittle nervous I mean I'm sure everything is fine but still.