How to stop my period in advanced!!!!!!?

alright, so im 14 (does that help any lol) and going to my friends beach house this thursday for a few days and i havent kept track of my period and im pretty sure its due in the next few days.........is there a way OTHER then using birth control to atleast stop a heavy flow or if possible stop it fully. like can exercise help? like are there any foods or activities to help stop it? thanks! i dont want to not be able to go in the water or ruin our "vacation" thing hahaha