Donkey / Wil'mom, go with a ping chang xin, should be fine. When I did mine, I also freaked big time due to high risk age group. My result was 1: 1300+ or 1:1500+, super low risk.
My gynae was sharing with me, this kind of DS tests were done at much later stage in earlier days but now everybody want to know earlier, therefore, now can be done at 11-12weeks to detect earlier and decide what to do earlier.
There is another test which you can do, CSV or something, less invasive.