I hope things go well today Missfrick & Mummy3.
That's great news DrMum, I'm glad they have a reassurance plan, when you have a loss that is almost as important as regular care.
The NT test has to be done between 11 & 13 weeks for it to be (somewhat) accurate. When they give you the results, if your odds are on the higher side they will offer you the option to take a more invasive test (one of the ones that carries a miscarriage chance). I believe there is some kind of newer test that is accurate without the risks but I'm not sure how widely available it is, I don't think it is covered by insurance and I believe it costs a few hundred dollars (I can't remember the name, I will update if I remember).
I am saying this merely as my opinion, not to change anyone's mind or belittle anyones' opinions/decisions:
We have declined the NT test with our past pregnancies and will again with this one. I feel the scan is not accurate enough and only ends up causing needless worry. Plus if it comes back with a higher chance then we will be put in the position of trying to decide if we should do the next test. For us, the results won't matter, they won't change anything and I feel like it is a scan that I can avoid having... I know I will be having tons this pregnancy, so anytime I can avoid one I will try.
I know lots of ladies do it because it is an extra chance to see their baby and when you only get a couple of scans for the whole pregnancy, I definitely would do the same. I would still let the results fall on deaf ears though. A search of the forums will show there are a lot of stories from women who were devasted by the results only to go on and have completely healthy babies.
Again, I'm not saying don't do it or trying to change anyone's mind. It is one of those things that is personal preference, to each his/her own.