why are you worried if the test in 96% accurate and it came out normal? then I would think you are to be relieved. NOT worried. By the way FISH is accurate in rapid Trisomy 21, but still not accurate at Down Syndrome. There is still a great area of inaccuracy, depends on what chromosomes they are looking at when they do the test. It says everywhere that its LIMITED information. Even Amnio can be wrong. It can only give you a percentage and possibility of a fetus having it. The hard part about this? When a baby is formed, during conception, if they are fated to be down syndrome or ill with other things,well then they are ill, nothing you can do about it, till they are born. Worrying excessively wont help either. Just imagine your baby is fine. Think about your family and your husbands family. Are there any cases of Trisomy 21 or Down Syndrome? if not, then there is a wonderful chance your child is fine.
My sister was over 35 with her 2nd kid, and they told her to have an Amino, she did and they told her, her son had 86% chance at Hydroencephelitis (water on the brain) 52% chance of Down Syndrome, and would likely die a few minutes after birth. She went through the entire pregnancy miserable and upset. The baby never died or was naturally aborted, she prepared herself for the worst. I was in the room with her when he was born, and he came out perfect. Healthy and above average in all things. So just remember nothing is 100%