As has been said before, due to the limitations of the way the game is made, pregnancy will be added near the end of each girls' stories, in order to limit the need of extra sprites.
Android could also be 'pregnant' as a surrogate mother, to carry a child for someone whose build is too small, and carrying a child could be hazardous to her health, like Ashley, or someone who "doesn't want want to take the time away from her work", like Kali, or even someone who just doesn't want their family to find out they got pregnant, but doesn't want to give up their child. There are any number of reasons for such a thing...
This could not only help the young woman who wants the child, but it could also help Android grow closer to humanity as a whole, and a better understanding of life and how fragile and precious it is.