Hi emx, You have probably already had the best and most experience related response (marleysgirl), but to add my sixth penneth, I too didnt test, I didnt have the bloods even cause I was worried that they would give me a scary stat, I too felt that I could never terminate my baby so it didnt matter what they said, and I think that is the most important thing, if you feel you would need to terminate a pregnancy on the strength of the results then you need the test, sounds like you already made that decision though, good for you!! Like Marleys husband said, you are more likely to not have a baby with problems than to have one with the problems, and at 1 in 50 you are waaay more likely to be OK than not.
Another way to see it might be (again Marleys got here first!!) that there are lots of problems that baby could have, you have chosen to have your baby in the face of these, I have two Autistic sons and a daughter with ADD, they cannot test for Autism/Add and even if they could I wouldnt be interested, I see disabilities as differences, my children have abilities too, everyone does.