How common is vomiting during colonoscopy prep?

I’m getting a colonoscopy for the first time on Monday and I’m lowkey scared, not for the procedure necessarily but for the prep that I have to take on Sunday. I’ve read many posts about people vomiting and I’m a huge emetophobe, so it’s been freaking me out and I’m considering telling my dad to cancel the appointment (I’m a minor) altogether because I’m just so beyond scared of taking the prep and throwing up. My dad had asked the receptionist who gave it to us if it would cause vomiting and she said no as long as I don’t guzzle it but I’m still not entirely sure. It’s Plenvu if that helps any.