Your comment that they might expect to see a man made me laugh, picturing a pregnant woman coming into the interview--! I think that pregnancy should be a non issue. It is too bad that in this day and age it is, and that you have to walk around on eggshells about how to deal with what, HELLO, is part of the human condition. And the assumption that a pregnant woman or a mom does less than other women without children or men without any regard for whether they have children is just plain wrong. As said, in my own limited knowledge of this, pregnant women and women with newborns in my law school had the best marks on average.