Help! I'm on my period and going swimming tomorrow!!?

This is my 5th day on my period and it's still pretty heavy. I'm 13 and this is like my 6th period. I'm going swimming tomorrow with my softball teammates and we get our trophies (so I can't get out of it) i can't use tampons and I think it would be uncomfortable to swim normally like I'm not on my period. Please help!