https://www.mangago.zone/read-manga/shima_chanchi_no_tsugaijijou/
https://www.mangago.zone/read-manga/samezoku_e_no_sasagemono/
(Not really omegaverse but men get pregnant)
Here's the ones I've liked
https://www.mangago.zone/home/mangalist/2684731/
How to Snag an Alpha
Intoxicated (or Ni Jiu, cutest thing ever)
Into The Rose Garden (tw, can be quite traumatizing, read with caution, this is one of my favorites even tho it tears my heart to shreds)
https://www.mangago.zone/home/mangalist/2897219/
Enjoy ε=ε=(ノ≧∇≦)ノ
In dire need of good omegaverse stories