the relationship between Finn and Princess Bubblegum (PB) has always been fascinating. From what I remember, there's no canonical confirmation that Autumn is pregnant with Finn's baby. The show has a lot of subtle hints and deep lore, but this specific scenario isn't part of the official storyline. Finn and PB's dynamic is more about friendship and occasional romantic tension, but the show never explored them having a child together. If you're looking for fan theories, there might be some wild ones out there, but the creators haven't addressed this directly. The beauty of 'Adventure Time' lies in its open-ended storytelling, leaving room for interpretation but not outright confirming such plot points.