hoo boy, so I’m not the best person to answer this question as I tend to drastically avoid pregnancy fics but I’ve read sOME so here are my recommendations. If I’ve read it even with the pregnancy/kid storyline that means it was just SO captivating for me personally that it overrode it.
The Moon, the Sun, and the Star Inbetween – this one is just the cream of the crop to me, SO good and such a great balance between Kylo Ren’s struggle, the struggle between light/dark, and how having a child together affects it.
In My Bloodstream – admittedly it has been awhile since I’ve read this, but I remember when the one-shot came out VERY early on I was DEVASTATED and then to see it continue into a beautiful multi chapter was amazing. Although I wouldn’t really count it as a pregnancy fic…
The Proof of it All – AAAAAAAAAAANGST, also incomplete, but god DAMN it was early angst and beautiful and I want to cradle it
Redemption and Ruin – its a behemoth and worth reading
The Force Arranges a Marriage by @terapid is one that sticks in my mind when you ask about wedding, but it’s very nsfw lol
so those are my suggestions, but @reylofic has a much better list for pregnancy fic here. and for arrange marriage fics here.