What To Do when You Have Your period And Want To Play A Water Fight Game? ~ GIrLS OnLy~?

So me and my friends are going to have a end of the year water-gun-ballon-bucket-ect fight. girls vs boys But I got my period this week :-/ the fight is on the 10th OF June. But this is the day it should be over (so not that heavy) Last Week We Played But I didnt have my period although I was wearing a pad and the pad fell off b/c my underwear, pants, shirt got soaking wet. I am not allowed to wear tampons so... I have no idea what I am going to do. Can You Please help. also NO rude comments or like ewww or anything like that. Should I wear a bathing suit but this is after school..... *sigh* well thanks for helping!!!