I would also Like the Pregnancy Option. Sadly i would like it in the Middle of the Game/VN.
So would I but it's not realistic. That is something you'll only see in games where the pregnancy is the focus of gameplay and will always happen, or it will be just a few shots and then the baby is born and gone or something.
Tell me this though: Which part of pregnancy? Some people like the part where the MC impregnates the girl because that's the conquest/erotic moment, while others want to see it visually, and have sex with the girl when you can see the belly, etc.
For the second type, there's also the problem of realistic timelines in a non-sandbox game.