Pregnant and going for interview

Well, I encountered this, not me pregnant but my new colleague. To be honest, it can be quite annoying. Since a person is hired to share the work but unable to because pregnant women more precious and cannot too stress, some more new so cannot learn too fast. Ends up company paid for a full headcount but doing half the job. The rest of the team continues to suffer. It's a different matter if the company knows and still decides to hire. But when the company don't know, it really jeopardize plans.