I think he's pregnant here https://www.mangago.me/read-manga/hydrangea_cage/
Not pregnant but don't wanna ruin his future https://www.mangago.me/read-manga/kimi_to_tsugai_ni_narenai_riyuu/
off the top of my head
- dear benjamin (one night stand. artist changes towards the end and took me out tho)
- kiss me if you can (ongoing. complete novel. so fucking good u probably see it recced a lot)
- alphega (ongoing. complete novel. novel is so fucking good.)
- accidental baby (ongoing. mtl translation fighting going on)
- dog and bird (ongoing. so fucking brief tho but still excellent. i haven’t picked up s2 tho so don’t sue me)
- again, signal (complete. i am very mixed about this one. s1 is so tame compared to s2. second couple is super wild with the non con dub con ur typical bl manhwa flags whereas s1 is centered on an omega uke desperately trying to hide his child from the biological father in a very kdrama complicated fashion)
Hyacinth ( https://www.mangago.me/read-manga/hyacinth/)
The uke didn't run away because he's pregnant with seme's child tho, but he thinks he can't be with seme because he's not the person seme's looking for (an omega, yet for this one is called "special constitution")

pls recommend me a trope where pregnant uke runs away from seme afraid of ruining the future of the said seme,,, or wherein uke ran away cuz seme is too way out of his league