PLEASE PLEASE HELP!!!!!?

okay so I have Hershey track in 2 days and just yesterday I could jump 7 feet 6 inches (standing broad jump) and now the most I could do is like 6 feet 5 inches !!! I have been practicing more than usual yesterday do you think that's why? What if I lay off tommorw ? Will I be good for wenesday? Please ! This means so much to me . Thank you. !