I know that most pregnant women don't have to do NST's unless they are at or past full term, but some higher risk pregnancies have to do them. I'm diabetic, and typically my hospital makes all diabetic women start them at 32-34 weeks but my doc let me put mine off until 34, and then said that for the first week, I only have to do one. Normally they have to be done every 3-4 days until birth.
Are you doing NST's? When did/will you start and how often will you test?