A popular story in recent news is the "pregnant man". One point about this story I have not seen, yet, in popular media is the question of his/her gender. The focus is on the pregnant man, when our focus should be on the pregnant man. Is this person really a man?
Consider that legal marriage and sacramental marriage are different. You can be married legally but not married sacramentally. Most Catholics are familiar, I think, with that concept. Similarly, you can be legally considered a man - meaning you are living your life as a man - but still be a woman.Catholics shouldn't be fooled. We are very familiar with the idea of something appearing as one thing but being another; the Eucharist appears to be bread, but we know that looking like something and being something are different. You can have facial hair, have your breasts removed, have your body resculpted to look like a man, but are you really? What defines us as "male" or "female"; I think it is something deeper that can't be changed by a surgeon's knife.
For a shorter argument, consider that this "man" has a uterus and has gotten pregnant. Maybe I'm just being a stick-in-the-mud Catholic, but I remember from health class in school that if you have a uterus, you're female. :)
Don't be fooled by the spin. Science is God's creation, and it cannot and will not be used to disprove God or work outside of His rules. Everything is His creation, so it is impossible to do so.