Surprise Gender

Tomorrow May 24th, at 2p.m. at 26 weeks, and 3 days I'll have an ultrasound to see the sex, and make sure the baby is progressing as it should. Although I would love to go all out on a specific gender I feel I've gone this long through the pregnancy without knowing the sex, that I think I'd rather be surprised the day of. My due date is August 27th. I have a gender neutral car seat, and if it's a boy I'll definitely be set since I have a 2 1/2 year old now. Has anyone else wanted to keep the gender a surprise?? I'm going to have them write the sex down on a piece of paper so that my husband will know what we're having. I'm just going to wait though.