If the night before you have your periods, wear a tampon (small, heavy, or super heavy flow) as you need to see if it makes the morning less heavy. You can wear a tampon in the morning or the lecture before P. E class too so it makes the next hour easier in terms of blood flow.
Maintain a calendar to note in how many days your periods start. Each girl has her own period cycle. Note your own and remember which day you experience a heavy flow and when the flow is low.
Aim to change your tampon every 4 hours to prevent infections. [4] X Expert Source Rebecca Levy-Gantt, MPT, DOBoard Certified Obstetrician & Gynecologist Expert Interview. 3 April 2020.