My 12 week scan didn't show any problem but my 20 week scan showed an increased NT fold. So that was like the worst birthday of my life.
So my risk went from 1/1100 at 12 weeks to 1/104. Because we were so far along we were squeezed in within five days for the amnio and got the fish results two days later. Then had a phone call two weeks later for full results. Luckily everything was fine.
Also went through public hospital and didn't cost anything. Except a lot of mental anguish on our behalf.

Good Luck.