Actually, the way self-fulfilling prophecies are used in stories, the fulfillment isn't expected after the action is taken to avoid it. And if you take an action to avoid an outcome, that's because you expect that that outcome is at least a possibility.
So, if you just decide you want to avoid A, so do action B, then until you do action B, you sort of expect A. After you have done B, though, you no longer expect A. The way a self-fulfilling prophecy is most often used, it works the same way. Someone says A will happen, you try to avoid it by doing B, then you spend your time blithely sipping mocha lattes until A happens anyway, catching you by surprise. Or, at least, it would work that way, if the fantasy/mythological things usually utilizing self-fulfilling prophecies actually *had* mocha lattes. I consider this their failure, though, not my example's.
Self-fulfilling prophecy still doesn't fit, mind, because while it's pretty much always used with a negative connotation, a positive one would fit just as well. I.E., someone says that A will happen, and you do B to celebrate/prepare for/whatever A, which actually ends up causing it. The fact that B is an avoiding action is just how self-fulfilling prophecies are generally used, not an actual requirement. Technically, you don't even *have* to do anything for a self-fulfilling prophecy. One that causes inaction because someone predicts A, and the lack of action B causes A, would work just as well.
Plus, as previously said, a self-fulfilling prophecy is, as far as I know, called so only in cases where the prophecy is originally false, which isn't necessarily the case here. (Although, to be honest, how would we know whether it would be false in the future?)
So, sometimes they might overlap, but they're not the same thing. At least, I think. It's hard to tell, because at this point the phrase "self-fulfilling prophecy" is apparently used both in the mythological sense and in a social sense, and I'm not altogether sure what the differences are. (Which is why I didn't include "There is no actual prophecy" as a mark against.)