Saffy, thanks for your advice, it does reassure me! Among other things I had visions of going over like with DS (41w2d) and I just can't couldn't cope with the idea of having three more weeks of being so uncomfortable!

As for an amnio, I haven't had one but I was/am considered high risk for down syndrome, partly age and mostly because of the nuchal fold measurement. We decided against the amnio based on a number of factors and held out until the 20 week scan which we had at 18 weeks. LONG wait but we decided that since we wouldn't terminate based on results no point going through with the amnio. I know loads of women my age or older though who had much better results than me so I'm sure you'll be fine xx