I have slice of life installed (removed period folder) and mc command center but i haven't changed anything in there for that. No other mods.
I took to male Sims, made sure they can only impregnate and not get pregnant, had woohoo that would cause pregnancy, but nothing came of it. I don't know how else I can test this, but this doesn't appear to be an issue on my side.
Still, I can see a possibility of this happening if somehow some kind of safeguards fail, so I will make sure to double check for it.