I just had my ultrasound a couple weeks ago. They wanted me to drink 32 ounces of water that morning (my appt. was at 11 am) and to have it down by 9 am, 2 hours before the appt. When I got there they did an external ultrasound (jelly on the belly), had me empty my bladder after that, then came the wacky wand. I suppose if the bladder isn't full enough they'll have you drink water and wait a bit. Sure would throw off their schedule though.
hi there
that is absolutely right
good luck