
MissK, im so sorry you are having to go through this, I went through something similar in my first/last pregnancy where due to scan issues we opted to have a CVS done (amnio can only be done later on in gestation), our story didn't end well but the pre-lim results came back in less than 48 hours so we weren't left hanging. I think they are very similar procedures, didn't take long but was painful (they take a sample of the placenta which hurt)
Keep us updated, will have fingers crossed that it turns out well for you - heaps of people have high odds come back and it all turns out fine