1. As predicted, not something that will be done. Pregnancy content won't be a system, unless later changed, it will stay as a series of events with a payoff.
2. Variations of scenes are possible but not this as it would require a lot of work remaking most of the interactable scenes and doing just the sprite wouldn't work for consistency, and if done for Anna it will most likely be requested for the other girls.
3. Anna will have more shared content; there's plans to make the Anna route available if Ken loses his v to Samantha. Zhen is mostly completed but it could see a scene in the future (not a bad chance, but not a guaranteed)