Prom Tips?

My senior prom is on May 5th, the same day I'm supposed to start my period. And while I'm super excited, I'm kind of nervous that I'm going to bloat really bad, which has happened a few times whenever I start, and not be able to fit in my dress which is pretty tight on my chest (because it's off the shoulder and I didn't want to flash people... it does make my boobs look amazing af tho). I was on my period for my junior prom as well, but that was closer to the end of it so it wasn't as bad. Any tips for preventing bloating or at least making it manageable?