Thank you so much for working on an update for this game! I'm especially happy to hear about overdue states, more birth scenes and labor mechanics enhancements.
Please let us know if we can contribute to the development!
You have to craft a Spirit Stone in the Blacksmith in order to become pregnant. You'll need to slay some monsters in the dungeon first to get stone shards and the other item drops. Then you go to the backsmith to craft a stone and then you have to use the stone from your Item menu.