I'm doing a research study tomorrow that involves imaging and so I need to do a urine pregnancy test today. I've had a 20 oz bottle of water, 20 + ozs of coffee and am starting on a 20 oz pop. Still nothing - no urge. Grrrrrrrr. I was scheduled at 11 AM but rescheduled for later. My bladder is like a camel when I know I have to give. TMI.