Hi, So I Am A Competitive Cheerleader Who Recently Had

hi, so i am a competitive cheerleader who recently had started taking tumbling classes. I was doing my back handspring when my back started hurting. It hurts to arch or throw any tumbling skills and one day it hurt getting out of bed. This has been going on for a few days. And my lower back is still sore. How do i know if this is a muscle pull or something more and a should i purchase a back brace?