question....

I would refrain from telling the interviewer about the pregnancy.

I am going to be rather blunt...the interviewer is looking for a warm body to fill one of their staffing needs at the current moment. If they are aware that you are pregnant, they now are aware that you will actually create yet another staffing hole when you go out on maternity leave nine months from now. Employers usually do not want to hire someone if they are aware ahead of time that you will create staffing problems later on down the line.

In my humble opinion, do not divulge the pregnancy until the end of the first trimester. Good luck with the baby, and good luck with the job!