3D/4D ultrasound

Kendall • 3 year old 👦🏼 • 🌈 coming 4/20 •
We have an apointment today to have our 3D ultrasound done. I'm 28 weeks. Is there any tips or suggestions so we get the best pictures of him as possible. Like drink lemonade or don't eat to close to the apt or don't use the restroom...(idk) My sister went in for hers when she was pregnant and ended up not being able to see the baby. Is it better if he's sleeping or awake and active? Thanks!!