Hi Amanda,
Its a very hard decision to make, especially as you have recently lost a baby. I'm led to believe that the nuchal fold scan is for downs only and, as you say, is only 85%. I think you are a couple of weeks further on from me. I'm having the Bart's test done, which is a 12 week blood test, the nuchal fold scan and then another blood test @ 15 weeks. It has a higher detection rate than the combined/triple/quadruple tests, but then I am 37! My OH and I both agree that if there is a problem, I will have an amnio.
I have a friend who, at the age of 40, got pregnant and did not have any tests, as she is religious and would not terminate regardless of the outcome. Some would argue that to know of a problem in advance give you the opportunity to a) come to terms with it, and b) make preparations and adjustments in order to cope with a special needs child.
If you and you OH can't agree, may I suggest speaking to a genetic councillor who can give you a clearer idea of what raising a child with specific special needs will entail. Quality of life is important, not just for the child, but also you and your OH. There is much to think about.
On a lighter note, when we were discussing this issue with my MW, she was very reassuring when she said that even at my age, having a child with a chromosomal abnormality is very rare. I
t is very sad and terribly bad luck that you lost your child to Edwards, but I don't think that there is an increased risk of it happening again - unlike Downs. I really think you and your OH need to speak to a specialist about this - and very soon!
Hope this helps a little
Ciao...Kat xx