I do NOT have any mods in stalled on my game. I have the base game, the Outdoor's pack and the new Get to Work pack. Randomly my male sim got the moodlet that showed he had an upset stomach and it has...
Yep, I love that aspect of the aliens with the Sims. Aliens and male pregnancies are back. Mwuhahahahahaha! >:) Don't worry it's quite normal for males to get pregnant after meeting an alien. Happy Simming. The history of the aliens with the Sims: http://sims.wikia.com/wiki/Alien