Does the Universe have a wave function associated with it?

If it does, what would this wave function look like and what might it tell us, if anything, about how the Universe works?

It is my understanding that at the quantum level, particles have their own wave function or probability function. As structural size increases, the wave function decreases. The Universe started off at the big bang as an infinitesimal small point and then inflated or expanded rapidly. There must have been some time span along the expansion where the Universe did have a wave function, a probability function.

---------------------------

Best regards