I'm 40+1 today and had my first NST. It was absolutely not a big deal for me... lie on a table for twenty minutes and listen to the baby's heartbeat? I can do that! It was actually kind of fun.
Now, if I had other kids at home to be taking care of or a job I was supposed to be at or uh anything more interesting going on in my life... I might have said no just because it takes so long!
As for next steps if the NST isn't normal... I also had an ultrasound to check fluid levels and placenta condition today. My placenta looks "more mature" than it really should at this point, so I have to go back and have the same exact thing done (another NST, another ultrasound) on Friday morning. Whee hee. My doctor said that unless something is DRASTICALLY amiss (your baby's heartrate is all over the place, or decreasing when he moves, etc), that's all a weird NST means... that they'll do another one again soon.
Mother of two great little guys, G (9/28/09) and W (1/20/12)