AITA for reneging on our agreement?

AITA for telling my husband that I am going back on our agreement and I dont care

if he cries about it? My husband and I (both 32) have been together since we

were 19. Our entire relationship feels like it just blew up in my face, basically,

and I cant tell if I am overreacting. So, we both wanted 1 child and we have

planned this for YEARS. We wanted everything perfect first. The home,

the careers, the savings, the investments, the nest egg, etc etc etc because

we both knew from very early on that once we had a baby, I would be staying home full time and

raising our child. His brothers life was unfortunately cut short by a daycare worker when he was