Hi Jenny - see if you can get the ultrasound tech to take all the measurements they need to have your bladder full for FIRST, then ask if you can run to the bathroom before they continue! No joke, I did this for one or two appointments and they were totally fine w/it. :) It's worth asking! And don't worry, as the baby gets bigger it won't matter one bit if your bladder is full or not, since it's not as difficult to "find" the wee one. (I was so relieved when the u/s tech told me that.)