This information can be found in your application form, assuming you were asked to fill one out. It is necessary to determine your dependents and people to contact in case of any emergencies.

It is also normally asked to get a better idea of your plans and priorities, and how your personal plans may coincide or affect your professional plans. It should not be seen as something discriminatory, as these questions can be asked of men as well. Also, since there are certain industries/fields that may not be ideal working conditions for women who are expecting, it maybe something your interviewer might point out when discussing the job description. So answer honestly, but don't volunteer too much information. If you're planning to start a family immediately, or if you're already pregnant, it would be best to be honest about this, but note that this may not weigh in your favor as the company may be concerned that you would complete your training or orientation only to go on maternity leave for two to three months.