It was a good read where I didn’t think too much of the plot

literally! the only BL I've read that was bold enough to show the pregnancy and struggles was https://www.mangago.zone/read-manga/ookami_sama_no_ichizu_na_bouai/

Read A Tiger's Den. Although the seme is a horndog 24/7 omega is pregnant since the start until almost finish of the story. Oh! He also got pregnant by artificial insemination and not sleeping with the Alpha

Your gonna love this
https://www.mangago.zone/read-manga/making_a_child_with_a_beast/

Also Gentle Forest

not omegaverse just a sickly guy who became preggo because he have a womb

"Surge looking for you" has em, the omega went through quite a few struggles

I'm pretty sure there were more, but for now (apart from the ones already mentioned) these are the ones I can remember (that had a bump or delivery scene, even if for just a second)
https://www.mangago.zone/read-manga/okusama_ha_alpha/
https://www.mangago.zone/read-manga/love_is_an_illusion/
https://www.mangago.zone/read-manga/unromantic/
https://www.mangago.zone/read-manga/omega_bus_stop/

here to add a couple more I remembered lol
https://www.mangago.zone/read-manga/hosik_s_story/
https://www.mangago.zone/read-manga/how_to_chase_an_alpha/
https://www.mangago.zone/read-manga/blood_link/
https://www.mangago.zone/read-manga/ni_jiu/
https://www.mangago.zone/read-manga/gold_gray/
https://www.mangago.zone/read-manga/midnight_dweller/