There are some. However, the quality can vary. One story I read had a really unique take on it. Instead of just focusing on the typical pregnancy tropes, it explored how the pregnancy affected their adventures in the game world. It added a new layer of depth to their relationship as they had to balance their in - game quests with the upcoming new life.
Yes, there are. I found one where it delved deep into the emotional aspect of Travlyn finding out about the pregnancy. It showed their initial shock, then the gradual acceptance and how their friends in the Minecraft community reacted to the news. It was really interesting to see how the author incorporated the characters' personalities into this new situation.
There are quite a few out there. You can start by looking on fanfiction websites like Archive of Our Own. Some stories might focus on how their relationship evolves during the pregnancy, with sweet moments and challenges they face together.