Gender Ultrasound tomorrow..your best tips?

at 20 weeks, I drank water and 5alive, and my bladder wasnt feeling that full because they took me in almost an hour early for the scan. i told her i didnt think i got to drink enough but she said dont worry. on the scan, i could see the baby moving around though i couldnt really feel a lot of movement. anyway the legs were sticking straight out. i didnt find out the because they wont tell you at my hospital, but if i knew what to look for i could have figured it out myself, as the legs were straight out and wide open, LOL. I hope that means it is a boy, I hear boys will do that on account of the swelling . drink some OJ, the sugar should get him / her moving. Good luck!!