Did I Hyper Extend My Knee ?

yesterday during our bball game the girl was boxing me out and her went into my knee , it felt like my knee completely went backwards . It dropped me instantly and I was cryin , it takes alot to make me cry . It hurt worse then anything i've felt . My coach put his hand under my foot and told me to push his fingers and I could barely do it . I sat out for about a minute walkin around the court . He put me back in and it hurt the rest of the game . Today it feels a lil better , but it's majorly bruised under my knee cap . Do you know what i did ??