How does an alien men pregnancy start?

He'll have a negative moodlet with a baby soother. The first trimester, he won't be feeling well, odd nauseau. Second trimester, hmmm, I seem to be gaining weight from a messed up metabolism. Third, He's definitely suspicious. Then he can ask people to feel the baby and be asked about the due date.
I've only had it happen one time and he was an alien. So the baby was a full alien.