I don't want to switch the side of the bed with my pregnant wife.
OK, is there a reason you don't want to?
It's more convenient for me.
You should try to make a compromise in your relationship. She is carrying your baby you should be a bit more kind to her and try to make her comfortable.
I don't care about her. Her happiness is far from my thoughts since she deserves it.
If you want your future child to be its happiest and healthiest, you should help your wife out during her pregnancy.