I am overwhelmed by the number of responses and by the kindness and support each and every one offers. I really cannot thank you all enough. My faith in humanity (womankind especially?!) has increased many fold.
Firstly, Nutella43, I am thinking of you now as you wait. The waiting is certainly worst. I am hugely hopeful for both of us, and anyone else in this position, that all will be well.
Thanks so much for practical advice from all. I think it's too late for Nuchal scan (and I understand they're not very accurate either). My 20 week scan is next week. My hospital don't look for soft markers at this scan and say few hospitals now do-- not sure I believe this, but also know soft markers are not very reliable indication either. It should, as some of you suggested, pick up serious heart defects.
I asked my NHS hospital what their own amnio miscarriage rate was and they say it's the same as the national average, 1%. We would not terminate our baby, so I'd find it very hard to face that risk. We could look at amnios done privately, and after all your messages, I may do that. Depends how much the uncertainty and anxiety gnaws at me in days ahead, I guess.
I have been reading up about Downs and, having taught Special Needs, I have some limited insight into learning disabilities generally. I know I would love any child more than life itself. What I fear most in all the world is having to watch my child suffer either physically or emotionally and worrying about what it's longterm future will be (after we're no longer able to care for him/her).
I am trying, trying, trying to focus on the positives and consider myself lucky in the numbers but also in being forewarned in the event my DS/DD is the one.
Most of all, again, I am just grateful for all your voices. Nutella43, my thoughts are with you.