They did it only 4 -5 days and Omega has the symptom like Vomit! It will be illogical if he really pregnant! Normally, it cannot be that fast! Staroz
I would agree with you if we knew for sure he was pregnant but we don't know. It's not like they went to the hospital and checked, it could be a cold or something.
This manga is not so logic about pregnancy like other Omegaverse! Although I like a strong Omega but not this! ┑( ̄Д  ̄)┍