I have to have a pelvic ultrasound next week and the thing I'm dreading most about it is having to drink all that water and not being able to go to the loo. I've been told to drink 1/2 pints an hour beforehand and not to empty my bladder until after the scan. However, I have a very weak bladder and can't imagine how I'm going to avoid going to the loo for all that time. Also, my appointment is late afternoon and I'm concerned that it will be running late. So, not only having to hold it all in for an hour before the appointment but then possibly having to wait a while for my appointment, then holding it all in during the scan. If I was absolutely desperate and had to go to the loo just before the scan, would this be OK if I carried on drinking the water after I went to the loo to keep myself "topped up" or does it definitely have to all be drunk a full hour beforehand? Grateful for any advice, thanks!