Ok i'm worried please help?

Ok so me and my friend were talking on the phone when all of a sudden I heard this weird noise an then the phone hung up. I tried calling back she just hung up. I tried a few phút later it rang an rang and rang . She is not responding to text hoặc calls hoặc anything! Please I don't know what to do i'm not sure if its because i'm a extremely paranoid person hoặc what? Should I wait till tomorrow hoặc try an get a hold of her now? hoặc what would bạn do in this situation?