Can you get pregnant from woo hoo?

I read on another tread that someone got pregnant from just woo-hooing but it hasn't happened to me. I did however have one unsuccessful pregnancy. I think it is because my sim had triplets before trying for one more and she was 3 days away from being an elder. But i made them try again and was successful then. I wanted another child after the triplets because all 3 were boys! the next baby was a boy too. Oh well no girls for my current family...