First us was horrible! I followed the instructions at first. Drank all the water and was done an hour and 15min before. At the hour mark I swear I was going to burst! So I cheated, still an hour I figured, that's close. Went to the washroom and then drank like mad the same amount again. Was dying 15 min later and Dh and I drove off to the scan in a hurry as I couldn't stand it! Made Dh stop at gas station as literally could not hold it and felt sick (also was looking six months pregnant as full of water bloat). Went to washroom at gas station on way to scan (30 min prior) and bought and chugged bottle of water. Got to the scan and when I went in it felt like I was going to burst , she had me empty out some!!!!
So, pretty sure I have the smallest most over active bladder ever. Will not be following the instructions quite so closely next time as clearly not necessary with my over active bladder !