The big bang didn’t happen in a pattern, it happened everywhere at once: nasaspacenews.com/…/is-the-universe-infinite-new-…

The universe expanding means it gets sparser. It has no edge and no center, so it’s not spherical. It’s either infinite or repeating (e.g. it might be the surface of a 4D torus, but as said: that doesn’t imply an edge). I personally believe it’s infinite and not repeating.