Yes it's an ultrasound at 12 weeks, that investigates for the Down Syndrome, and at that time good nub shot would be very good for the early determination. I got mine at 12weeks 3 days gestation, you can check my post one month ago, there is the shot of my baby boy.
2008, 2010, 2012 ... i love my boys, but is this the end of the road for me, or would i try again for a mother-daughter dream to come true?
As much as you want to plan your life, it has a way of surprising you with unexpected things, that will make you happier, that you originally planned. That's what you call "God's will" (unknown author)