Girls, HELPP!!! periods?

i got my schedule for school and i have P. E. and my mom wants me to join sports ( track ) but i dont know how i can do that when im going to be on my period and going to be having cramps that kill me :( and the worst park i have my period for 7 days :( and i bleed really heavy... my mom doesn't want me wearing tampons, and i kinda dont want to wear them either help me plese school starts in 2 weeks
Girls, HELPP!!! periods?
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