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.

The baby is pure alien even if the father is human when it's an abduction child. First the father will have a weird tummy ache and think it's something he ate, but he'll have a lot of animations of his tummy sparkling and him saying"whoa, nuboo?" so even then he suspects it's a baby. phase two is weight gain, and he hopes it's just a phase. Phase 3, he's very suspicious and, pretty well knows he's pregnant. Then he's terribly miserable in labor. Not a happy sim at all but, it's all worth it for the alien bundle of joy he gets.

Now if he's not at a point in life where he is ready for a child, he can send the infant to the homeworld and, that's that, it's as if the birth never happened, the child is gone forever.

Alien babies get different birth certificates too, if you have them at the hospital.

And different bassinets. You can have him take a pregers test on the biffy. My sim didn't have baby each time he was abducted. He was abducted 5 times and only had two babies.

I dunno what is going on with my male sim. The weird music came on again and he was looking at his stomach but there's still no moodlet or belly.
And I've never been able to take the test.

When my sim was pregnant the last time he had that music and little sparkles at the belly and his stomach grew very slow, I thought he would never have the kid. So maybe they have added and changed it cuz I don't remember the sparkles b4.

how long does the pregnancy last with males?

My last one lasted about 4 days, I almost just told him to have the baby, but I wanted the bassinet for a planter.

hm...okay. I guess I'll just wait and see if he gets the belly or not. It's been almost 24 sim hours.

Did you try pregnancy test?