What if i get my period while swimming?

have the swimming unit in gym this week and im supposed to get my period one of these days. However, a note isnt an option since my teacher said to just use a tampon. WELL NO DUH! but my period hasnt come yet, but i can feel that it is. Im not just gonna insert a dry tampon, that’s gonna be impossible to take out if it doesnt come, but if i dont wear one and my period comes while im swimming, that would be nasty and embarrassing, WHAT DO I DO?

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