Is something wrong with my knee?

You said you didn't hear a snap/pop because you were around loud music, from my own experience you will hear it no matter what noise is surrounding you as well as feel it. If you felt your knee "pop" as it were you could have ruptured your acl, with this injury you will feel little after a week and will be able to walk however if you twist or turn you will feel your knee shift dramatically. There are several tests you can do one of which is to squat. If you can't squat you have severe ligament damage. You say your a competitive athlete? Then yes I would deffinetley get checked out for an acl rupture or sever, best bet is to get and MRI as soon as possible! The thing with acl ruptures are you think you've got nothing wrong until you go down on it again from a simple turning manouver!