Sim male fiancé refuses "try for baby"? Hates children. Is Pregnancy possible?

Because the vanilla game try for baby is a more and less a planned baby, people that hates children aren't going to want them, maybe change that trait with the re-trait potion in rewards store or maybe if you have a computer and don't mind using mods, you can use the wonderful whims mod it's similar to another that isn't age appropriate for everyone but this mod wonderful whims uses the woohoo that's already in the game, it's the clean version, it's more teen friendly aswell but accidental (surprise) pregnancies can happen with this mod