I was told to drink 1.5 L (6 cups) 1 hour beforehand for my 18 week ultrasound (I'm currently 33 weeks along). Halfway through the fetal measurements the US tech had to send me to the bathroom to pee 2 cups of urine because my bladder was too full! I thought I was going to pee myself...!

Edited By: gaia18 07/18/2012 8:41 PM. Edited 1 times.