Ultrasound?

Last night I had my 20 week check up, I am at 19cm so I am growing along nicely and I have gained 5lbs. Blood pressure is great as usual (hopefully it stays that way throughout). The doc talked to us about getting an ultrasound and he said if we wanted to wait a couple more weeks then we can so that we can use their brand new 3D ultrasound machine. How cool is that!? They have a new building set up near the hospital and part of it will be dedicated to children and mothers only. I thought that was just great! So we decided we will wait for the 3D ultrasound machine to be available so we can check it out. I am really excited about it! The only thing is having to wait longer...