I wish you did see the program it was quite good. There was a couple there who was given a 1 in 8 chance of child being DS and he came out completely normal. One of the scanning guys said that if you use two different types of scanning devices during the ultrasound, it can produce very different results...
so try to hold on to that hope - and don't think about what could happen, just keep safe and well until you know what WILL happen.