Anatomy scan

Sarah • 24, married & 3 kids ♡♡♡
My anatomy scan is tomorrow at 1pm. I was wondering if I eat lunch before i go, but I'm afraid if I eat my LO will go into a food coma and won't show the goods. I have to drink 32oz of water before hand & ill b bringing OJ with me to drink right before the scan. Should I eat or wait?