@ryoung,
All of the space that is now filled in the Universe was created at the Big Bang. Before that there was not even empty space...
there was no space. Think about this carefully, there is a big difference between empty space (i.e. space filled with nothing) and no space (i.e. no space existed). The latter is the one that is correct.
There was no space to occupy. This is a little difficult to comprehend, which is more a problem with our minds then with science.