New Husband,
Household help is quite common these days, so I’d say bite the bullet and get her help. You can have someone for a few hours once a week… from personal experience this goes a long way.
As far as your concern about building resentment if you constantly give in: Don’t fret so much about the future. If you are able to be gracious and understanding now (especially because she is pregnant) then do so without worrying about how it will affect future communication. Marriage is about giving. If you are better at in than her right now, embrace it.