An OB appointment update

I had an appointment today as I mentioned earlier. He's still rather concerned that I'm not gaining weight and getting bigger in the areas I should be. I am scheduled for a Non Stress Test tomorrow morning at 10am. They want to make sure that baby girlie is "happy" where she is. I'm not entirely sure how they'll know, or what they'll do if she's not. I'm pretty nervous that there could be a problem. I'm not used to this, because when I was pregnant with Hannah everything was easy.