I think this could be a good feature. Maybe it could work like this:
- Optional feature enabled when generating a new town.
- Chance of impregnating girls whenever you have sex with them.
- They'll let you know they're pregnant when you next meet up with them.
- Timer in the phone screen to track how long they've been pregnant for.
- Their growing bump will be visible on dates.
I'm not sure how long the pregnancy should last for though. I don't think it would be much fun if it took 9 months of in-game days. So perhaps 3 in-game days could equate to a month of pregnancy to speed things along? What do you think?