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My college physics class just talked about this concept. So I can give you a university answer for your question, but whether you or I or someone else believes it is up to you.
To start out with I'm going to talk about forces.
Modern physics says that there are four main forces in the universe.
Strong force
Weak force
Electromagnetic force
Gravity
Now electricity and magnetism are often thought of to be different forces, but actually when viewed from a mathematical point of view (that sentence isn't quite right)
They are actually the same force.
If you have an electical field (field is what supplies the force) then you expierience a electrical force. BUT if you are moving through the electrical field, or the electrical field is moving, THEN you expierence a magnetic force.
If all depends on your point of view, or what reference frame your in.
So that's why it is the electromagnetic force not two forces
So scientists were like, hey we combined those two forces, can we combine any more?
So it turns out (in a complex mathematical way, WAY more complexed then the electromagnetic force) basically if you raise the temperature high enough, then the electromagnetic force and the weak force combine into the electro weak force.
So physics people were like 'sweet' and tried to combine the forces even more.
So basically if you raise the temperature EVEN more then you can combine the strong force with the electroweak force.
And right now people are trying to combine gravity with these forces, but haven't been able to. There is a semi promsing theory called string theory that is being made, but so far no single force has been mathematically shown
So laws and theory's are a construction made by human beings. They are constantly being reevaluated and changed. And Law's are just theory's that haven't been disproven for a LONG time.
One example is Newton's Law's of motion.
Those laws are actually wrong when the velocity's aproach the speed of light, a new theory had to be made to account for this.
So I'm saying its more the forces then the theory's being made. The theory's are changed to represent expiriments.
But to continue with the combining the forces
The forces should all (theoretically) combine at a high enough temperatures
Now this temperature only exists maybe in the inside of stars. It is probally higher actually.
But where did such a temperature exist. Or according to my profesor, when did such a temperature exist.
The answer is, of course, the big bang.
So if you draw a graph of the comparative energy level of the different forces compared to time. Draw four forces at today's time. but show them combining as you go back in time. So back at when time = 0 then there was one force.
And if your question now is, if I go back in time, will I measure a different amount of force?
The answer is no (because we know that common sense wise) but the forces aren't changing, its the mechanism that is.
There is a concept called Higgs mechanism, and that is that when a symetry breaks then a force is created.
A symetry is sort of like
Conservation of energy, its symetry is time translation invariance
(moving in time doesn't change) look up invariant in a dictionary
So people are searching for a new symetry so that all the forces can be combined
Another application of this Higgs mechanism is Higg's bosons, which people are looking for.
(I don't know too much about the symmetry or the Higg's mechanism, I just know that my proffesor briefly mentioned it in this context)
In short, the theories and laws change by humans changing them to account for the new information they find or new logic they use. But forces can be shown to mathematically combine as you raise the temperature (aka go back in time)
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