Do you let random chance decide your sims' pregnancies, or do you cheat it with MCCC?

Woohoo in my game (if not try for baby) is set to 25% I think. It's funny how many times I manage to forget about it when my sims have a little extra fun spontaneously and then bam. ?

I've played the game a little juiced before and loaded my save the next day wondering why my sim was pregnant. Had 0 memory of trying for baby but it happened.

If the roll of the dice is being difficult I consider science babies as an option or adopting.