The universe is expected to have gone through different phases, or epochs, during it history. I am not sure this is what you want to talk about.

For instance, we have the so-called electroweak phase transition corresponding to the restoration of the electroweak symmetry (strictly speaking, this is a cross-over in the Standard Model but not necessarily in its extensions). On each side of the transition, the laws of nature are different (here, the particles are massless prior to the transition).

So not, this is not speculation, but expected! :)