Alien Abduction/Mpreg stuff...?

I had just made a sim and he had had his first promotion in the medical career. He had litteraly just gotten his girlfriend who lived next door pregnant with a second set of twins and then one night he got out of bed on his own and the action read 'examine strange light'. Then he stood outside and was abducted and got pregnant :/ I was really confused as I never experienced aliens in sims three and in sims two it was different. But now I'm really confused as to what happens with my alien son. He's only a child at the moment, but other than his disguise will any other weird things happen with him????