Check the oil level.

If the level's okay, then you should be fine. Of course some is going to spill out, but as long as you were running with sufficient oil, it should be okay.

I would, however, have the oil and filter changed again. You don't know what dirt or other crap could've fallen in there while you were driving, especially if the underside if your hood has any dirt on it. I'd change it again, oil and filter, make sure the level is good, and that everything sounds okay mechanically.

And I sure as hell would make THEM pay for the second oil change.