Yes, you can. Mainly about the quality, possible difficulties or outcome of pregnancy or of any procedure such as cesarian, etc.
As for asking whether someone is pregnant or not, pharmacy test kits are as reliable as, or more reliable than, astrology, and cheaper.
Horary astrology can be useful however to tell whether someone will or will not get pregnant, via IVF, for example. This modern medicine cannot do but astrology can.
I do not answer questions about baby gender. The astrological techniques available are unreliable. Just wait a bit and do medical exams.