i don't know if you need more info Elkiedee, but just thought i'd add my thoughts.
my combined results can back low risk - however, my nuchal fold scan itself was very high risk, and i had to wait a week between that result (1:43) and the combined result (1:2100)
in other words, i had a week in your situation.. i decided that i would have taken the amnio if combined had come back high, not because i knew i wanted an abortion, but because i wanted to prepare for my baby if I knew that it had Down's.
I spent a lot of time on the Down's Syndrome Association website, which is amazingly helpful, and strangely reassuring. Can't explain why exactly, but it shows what a positive experience having a child with Down's syndrome really is..as well as a big challenge of course (but which parent can't say that about their child?)
You must be so stressed about this but i'd advise you to listen to your heart (and avoid the internet if you can, apart from this site!) - do you want to be more prepared for the baby if it is positive, or can you try to relax and wait for the outcome? God, what a position for any of us to be put in...
Either way, you'll get through the next few weeks - best of luck with it all..
By the way, in the grand scheme of things, you ARE low risk - it hasn't shifted from your age-related risk, but somehow that doesn't mean anything when it's you, does it?