Since the house is yours, you afforded it before he came along, right? So although he's the higher earner, your wage alone is enough?
Why not sit down with him and lay all your cards on the table. You cannot go through the work of having a small baby and toddler again. Pregnancy would be hard enough. If you were to even consider it, then he would need to be the one to go part time, or to become the SAHP. How does he feel about that?
If you both decided to put the child in daycare, would he be happy doing the pick ups and drop offs, and taking all the time off for sickness? How would he make that work?
You would need to cut back on things, to afford it, what would he suggest?
Really go through all the practicalities and be firm that your career cannot take the back seat again.
But don't have a baby to keep him. That's not a reason to bring a child into the world. Remember that they are a person in this too. Your resentment towards the baby and your dp could result in a breakup anyway.
Don't have the conversation above unless you would have a child under those circumstances, that would be unfair.
I know I couldn't go through pregnancy again.
Be honest. Be clear. Don't do something you don't want to for all the wrong reasons.