Unless my Sims (or with a mods help) woohoo autonomously, there is never any "just woohooing because". There is only Try for baby, because I'm a family player. :)
However, I will say that I've been fiddling around with MC Commands settings and now have my game where if they *do* woohoo autonomously, there is a chance they can get pregnant from just a regular woohoo. I like the surprise of a natural birth instead of "hey, go try for a baby already!" this makes my legacy families more enjoyable, because sometimes, it's a full house, and I've adjusted the household to 10 members (to allow some Pets to be in the household and not take up Sims household space due to the 8 limit) :)
And then .. they're expecting. Makes the game more challenging when there's a lot of Sims to take care of and I love it :D!
