Don't. EAT.THAT.BURGER.

I think you don't already, and that's nice XD You're just in the beginning, fear not!

yeah, the non-loss might have been your body beginning to create muscle, and the results won't be all definite, even in weekly basis. I've been in similar fear until recently but reading on all this I'm also beginning to understand and regain my hopes :D

don't give up on trying!