Of course it makes a difference.
Even a decent chauvinist wouldn't put his wife out if bed so he could have the comfortable bed alone.
If he wants to abandon the marital bed to make sure he isn't disturbed by the arrival of his new baby, then it is up to him to organise the spare room to his liking.
And be very careful if where this is going, OP.
First it's that he needs to sleep elsewhere so you deal with nights all alone so he can sleep.
Now it's that he is so much more important than you that he should have both the comfortable bed and the full night of undisturbed sleep.
Are you spending your maternity leave doing all the housework too since "it makes sense"?
Stamp this one out quick smart.
How ungallant to ask your sleep-deprived wife to take a bed you find uncomfortable.
My grandfathers would have been ashamed of such behaviour.