Fever after PE

Hi so I recently made a post about this on Tuesday. I had gotten a fever after PE class. Today is Friday (pe day), and I have fever once again. So PE is third period. I ran 4 laps in a row (3/4 of a mile) and immediately stared breathing weird after I finished. I was running with girls at the same pace with the same amount of laps, and they were fine. 2 weeks ago, I could easily complete 6 laps with no strange breathing or fever. All I wanted was to sit down after my run. Then we had regular pe (basketball). At lunch, I was so tired that all I did was sit the whole period. Then at math (6th period) I felt my head and it was extremely hot. My formers felt and and they thought it was a definite fever. When I got home I checked my temperature, and it was only 99.7° F. That isn’t that high right? But just the act that this has happend only on PE days and that I was fine on Wednesday, Thursday and anytime before PE is kinda weird. What do u guys think pls help.💕❤️