I'm going through the exact same thing with a character I rolepay. I've always hated kid!fic and argued that characters tend to go completely OOC when just dropped into a fic where they're suddenly married with 2.5 kids and everything is tooth-rotting fluff, especially if they've had to change the whole entire canon to do it or have it completely not canon (for example, a canon historical setting made into a modern AU) for it to work.

And now my roleplay character is engaged and their fiancée is pregnant and if I tried to explain it to anybody else they would look at me like I'm mad because it's just so... not canon. Like there's elements that I could grasp at straws with (the other character has always wanted kids/a family but they can't have one for canon reasons) but there's no way to explain it without sounding like the exact people I used to hate and it's maddening because all I could say is we've been roleplaying them daily since March and it makes sense to us in this weird little bubble we've created. But yeah, I could never write it as a fic; "x and y get married, have kids and live the perfect white picket fence life" without everyone I know raining down an apocalypse on me for how anti-kid!fic I am =/