I guess it depends what you mean by "taking care of." In general, I think it's fair game. I think I had at least a couple of questions pertaining to pregnancy on my exam. I would especially know a bit about eclampsia, preeclampsia, lab tests for Down's Syndrome/neural tube defects/fragile X, what commonly used (or commonly tested) drugs are and are not safe during pregnancy, etc. I wouldn't go nuts with the details, but hitting the major points will probably serve you well.