I just experienced my first in this game - Ethan was going outside to "Investigate". No - no! What I did was type in testingcheats on - and then shift click your sim, and press the top one "reset"....
this sounds horrible, oh my actual god. I think there'll probably be a patch released soon that addresses this issue. Probably gonna tinker with some probability settings. Because I have a strong feeling that they didn't intend to have pregnancies happen THIS often.