What should i do? really short?

i have a huge horseshow this weekend against this girl i can't stand. its three days long. unfortunately, i have severe bronchitis and will be getting my period in my white breeches. i know i can show with bronchitis, its the running around and physical exertion and walking. its supposed to be cold and rainy all weekend. what do i do? try and kick the girls *ss and risk getting really sick? or just stay home?