as the others have said, dont gulp, you will be fine, have had a few of these since bypass for various things leading to hysterectomy and only once was it not quite full enough! Happy to say last time I was scanned briefly in the clinic room having drunk nothing but normal fluids as I didn't know my consultant was going to scan me and they did it and saw a clear picture cos I have lost so much weight YAY!!!!! That was a breakthrough moment for me having had to have vaginal scans for the last 20 years dueto my size!!!