Well, I suppose that would work. If it was just one Sim, and it wasn't happening throughout the entire neighborhood. I don't exactly want to zoom out every few weeks to perform maintenance work on every pregnant woman in the neighborhood. Perhaps there's a bug somewhere in the pregnancy code. Or does it happen in the main game as well (with or without patches)?
Dang it, I just wanted to do a simple wolfing run, not debug a third-party mod.