A.
My amnio went like this:
I definitely wanted the test, and I don't mind shots, but it was still nerve wracking. Not painful, just a big jab and a 2 minute wait while I held my breath.
The baby's heart rate is monitored the whole time, and for me the baby didn't stir or feel a thing.
There wasn't any pain afterwards either.
Call the office where the procedure will be done, and they can answer these questions (I did) the genetic counselor will speak to you beforehand anyway, and mine was VERY reassuring and nice.
Don't let the anti-testing people scare you. The risks are minimal when done by an experienced doctor. The "what will be will be" wait and find out attitude would have stressed me out MORE than having the test!