hmm
Kiraide Isasete
Kashikomarimashita, Destiny (i think skips the pregnancy to after birth)
Okusama wa Alpha (p much skips the pregnancy to after the birth)
Tadaima, Okaeri (Yaoi) (starts with child rearing)
...ironically, I think Hosik's Story, with all its problems and also despite it not being omegaverse, does the best in fleshing out mpreg - the bump, going to the hospital, being upset about unexpected pregnancy, unsure about what to do, trying to figure out how to balance pregnancy with their life before, morning sickness, etc.

I love the time period where omgeas go through pregnancy.The bump, hospital visit , morning sickness, mood swings, cravings , all of it .I wish some author would dedicate whole manhwa on the pregnancy and delivery stuff with daily fluff of baby and their days and eventually baby's school days and grandparents and visitation and stuff. Hope my prayer gets answered soon enough otherwise I will make it happen myself