I just don't think we know enough to really explain the conditions of the universe that far back, but I must admit that I'm fairly partial towards the idea that the universe is a cyclical construct that expands, contracts, then expands again. From a philosophical standpoint it seems more rational to me than a universe the explodes from nothing, then expends forever into the heat death of everything. That particular idea leaves me cold. (ahem).
I strongly suspect that the way the universe really works at both the quantum and macro level is ultimately even weirder than we now suspect.
Or the Universe will end with the Big Rip roughly 16 billion years or later from now.
From the way it is described, you will see the galaxies fly apart, then the stars, then the planets, then you.
It will be cool to watch. You could conceivably use near lightspeed space-travel via Einstein time-dialation to go foward in time to Douglas Adams’ Restaurant at the End of the Universe and literally watch it all go foom while drinking champagne.