I've had several requests for this! I'm hesitant to add pregnancy to the game though, because the main character is an 18 year old high school girl and her getting pregnant at that age would make things complicated.
I mean, life is complicated and many people have kids at that age and have to deal with the consequences. A big reason people enjoy the fetish so much is because you can escape the real world and enjoy those fantasies without having to endure the real life consequences. In a way it's on a similar wavelength as the entire TF fetish because that is almost pure fantasy.
I guess my point is to say getting pregnant at 18 is more complicated than suddenly becoming the opposite gender at 18 is... weak. In fact the way things are these days, people hardly blink an eye at high school pregnancies so I'm not sure where that is coming from.
It would be easier if you just said you don't want to add pregnancy because you don't want to and it's not your thing. People might still ask, because some people obviously like it, but that's a given in any fetish request.
I used to play this game a lot, but I haven't been back to it in years because it was stated that you were not going to go into pregnancy stuff at all and I just tend to not waste too much time and money on games that explicitly state it won't be present. I have enough trouble wasting time and money on games that plan it but never actually get to it in any meaningful way, so I cut my losses when I can. But this game was truly awesome when I was playing it.