Generally conservation of energy applies in a closed system, so wouldn’t apply at the creation of the system.
(Plus we can’t (yet) be sure what caused the Big Bang if it happened)
I’ve always liked the idea that matter, space and time are the way we observe the interactions of fields. So gravity waves make an interesting idea as to how part of it might work
Did you know there is some evidence that our brains are apparently aware of certain events before they actually happen. This isn’t supernatural but possible evidence of something going on outside of the space time we are familiar with. Or that time is not a straightforward arrow in one direction.