I don't think I can help you too much with your question directly but I do know that I have been offered the test for both of my pregnancies and declined it. Even if there is something wrong with the baby I could never abort it. the baby I am carrying was meant to be in my life.
Regarding your situation...if you are planning on having the test done just call your Dr and ask if and when you are able to get it done.
I know some people who have received a false positive and had the amnio done out of fear. They all said even if it came back positive they wouldn't be able to abort their babies. So why bother??? There is usually a higher risk for miscarriage from the amnio than the chance of having a baby with Downs or other problems so I choose not to take that chance!