@SailorJerry - I've been there! I had the nuchal translucency test and they didn't like the result, so I actually had CVS (chorionic villi sampling). CVS is done earlier than amnio, at about 10 or 12 weeks, but it's a similar basic idea. They actually take a small sample from the placenta. (It's a little more dangerous than amnio, but we have a history of chromosomal abnormalities in the family and we didn't want to wait.)
With both CVS and amniocentesis, they do a karyotype analysis to make sure everything is as it should be. Thankfully, my CVS showed exactly two of everything (including two Xs - baby girl!).
Here's hoping that your test also shows that nothing is wrong. It probably will!