Besalel: marriage is about sacrifice but its about me sacrificing. It isn’t about me telling my spouse that my spouse had to sacrifice. When the focus is not on what you’re giving up, but rather that this is something that’s necessary for the good of the marriage, it bd ones an act of love and is no longer a sacrifice.
Op your wife is pregnant and is meanwhile creating your baby. Pregnant women are a species all their own. They think, act and feel different than their non-pregnant selves. When a pregnant woman says something, it absolutely does not set a precedent for the rest of your lives. However if you don’t appreciate your wife enough when she’s pregnant it will set a precedent that she will always feel under appreciated. Her body is at work all day creating a new person from scratch. I think she’s working hard enough as it is. If you can afford it, definitely get her the cleaning help. No man can understand how hard pregnancy is but you will have better sholom bayis if you try:)