Dumb ultrasound question

Veronica

So I'm having my first ultrasound today, and they want me to drink 32oz of water between 3:30 and 4:30.

So, here's my dumb question: Can I pee after I start drinking? Or should I use the bathroom before I start and then hold it for the next hour?

I have such a weak bladder. My SO calls me pissy-pants because I'm constantly just "not making it" 😂😂😂