Renstar, When they do the 18-20 week scan they do it normally and they'll only switch over if you ask them too. We got a couple of pics but found it was prob a waste of money for the 20wk scan, better off doing what Hollye is doing and going back at 28-32 weeks and getting a nice one done when bubs will have more fat, you get to have song in the background too depending on where you go. Would love to go again at 30weeks but dont think we'll be able to afford it again
Good luck