I had an amnio at 36 weeks to see if lungs were developed enough for them to take him out the next day. They had tried to get me to do that and the CVS and other genetic screenings because I was age 35. I had declined all because I knew we were keeping him regardless of any problems, and many tests are so risky. I do know the amnio can trigger labor, which the docs warned about, but I didn't have a choice in the matter. They did 2 in a row on me that day because my son actually moved toward the needle the first time they stuck me. I went into labor the next morning. Luckily, I was already scheduled for my c-section that afternoon.