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

How this sim acts with the hates children trait does make more sense that they are having none of it, one of friends don't like children, shes not mean to children ( unlike the hates children trait in the game) she wouldn't be my friend if she was, she does tolerate them but only just lol she told me she'll never have children ever, that they make too much of a racket and make a mess and she loves keeping a spotless house ? and her idea of a pet is a rock aswell just thought I'd add that in there ?