It should not affect her PR unless something else happens because of the pregnancy that could affect her PR. For example, if she is being sponsored by her employer through PNP and the employer decides to withdraw their sponsorship because she is having a baby and will take maternity leave, she would lose her application.
So did you land as a PR before you got married? Are you sponsoring her? Or did you still not land and you have added her to your application?
So did you land as a PR before you got married? Are you sponsoring her? Or did you still not land and you have added her to your application?