If anybody is interested: the entropy of the universe is said to be increasing, in that energy-density is tending to even out. Every time you do work, you reduce the amount of energy that's available to do work. You even out the energy density and increase the "sameness" as the universe heads towards

heat death.

Working back from this, cosmologists usually say the entropy of the early universe was very low. It sounds reasonable doesn't it? But have a think for a minute about the very early universe. We can be fairly confident it was small, and we can be fairly confident that the oft-mooted singularity signifies some kind of failure of mathematics. So let's say there wasn't any singularity, just that the universe was small. The energy density of this very early universe would have been incredibly high. But get this: it would have been uniform. So there would have been no available energy. So the entropy would have been high too.

The entropy only became low when the universe expanded, and you then had some regions with a high energy density, and some regions with a low energy density.

As for why the universe expanded: dunno guv.