To be hones, I have thought about it when I started the game. The truth is, this would require either deprecating all the events with this character at this point (after all this is not a VN, so it's not just a linear story) or re-working them to add the pregnant character, plus all future events to include both versions (which will require a ton of work and is too much for just one person making the game in my free time). So right now, there are no "plans" for this and even the first pregnant character, introduced in the game - Karen, comes with a "workaround" which will allow me to get around the issues pointed above (you'll see that in 0.6).