PREGNANT & LAZY GF HATES COOKING & CLEANING BUT DEMANDS TO BE A STAY-HOME MUM

How do I (31M) be delicate but firm and honest about my pregnant GF (27F) wish to be a Stay at Home Mom?
Disclaimer first: There is nothing wrong with being a Stay at home Mom/Dad

There are lots of situations where it makes sense for that couple

1. One partner makes enough to support a Family
2. The partner that works is just too busy and never home and someone needs to takes the primary role of home keeper
3. That stay at home parent likes doing the household duties

Point 3 is what I am going to harp on. I make enough to potentially support her and a baby. I work remotely so it’s not like I would never be home.

My GF is lazy and complains about everything. There isn’t an aspect of life that she doesn’t complain about

1. She hates working. There is not a day she is not complaining constantly about something from work or them actually having her do what her job entails
2. She hates cooking. Her diet consists of McDonald’s, some microwaveable food and instant noodles…
3. She hates cleaning. Her apartment is a mess
4. Too lazy and tired to walk her dog. Takes the dog a few steps from the house to go poop and back inside. If the dog doesn’t go poop immediately she gets pissed

How the F is she expecting to be a SAHM when she can’t even handle this stuff when she doesn’t even have a kid?

Idk how to firmly but delicately say I don’t want to financially, physically and mentally support her as a SAHM. I know I am going to have to do everything if she gets her way.

This pregnancy was not planned btw. Completely unplanned, I’m trying to make the best of it. I was honestly going to break up with her before finding out she was pregnant.