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When we say that the
universe is expanding or that space is expanding, what we really mean
is that the galaxies (or rather, clusters of galaxies) throughout the
observable universe are getting farther apart.
we can calculate what happened during the first few
minutes of time as we know it:
... Even if there were, I don't think anybody
knows how to talk about the first 10^43 second, much less what happened
"before" that, if this concept has any meaning at all.
Your phrase
"ex nihilo" seems to imply a time before the beginning when there was
nothing, and this bothers me.
If you haven't read Weinberg's The First Three Minutes, I highly
recommend it.