Another theme could be the reactions of their friends and family to the pregnancy. In the fanfiction, their friends might be excited, surprised, or have mixed feelings, which can add drama and interesting interactions to the story.
The theme of preparing for the new life, such as setting up the nursery, buying baby clothes, and making plans for the future, is also likely to be present. It can show the couple's hopes and dreams for their baby and how they are getting ready for this new chapter in their lives.
One common theme could be the exploration of the relationship between the two characters in a more romantic and often intense way. Another might be their growth together as a couple.
I'm sorry, I don't have specific kibahina pregnant fanfiction to recommend directly. You can try searching on fanfiction websites like Archive of Our Own (AO3). They usually have a large collection of various fanfictions including those related to the Kibahina pairing.
One common theme is survival. Since 'The 100' is set in a harsh world, the pregnancy adds another layer of challenge. The characters have to ensure the survival of the mother and the unborn child in a world full of danger.
Love and support are common themes. Usually, Bella's relationship with Edward or other important characters deepens as they support her through the pregnancy.
Another theme is the relationship changes. Her relationship with the baby's father might be explored, whether it's a new relationship or an existing one. There could also be changes in her friendships as she focuses more on her upcoming motherhood.
Family support is also a big theme. It shows how their friends and family react to the news, whether it's with joy, concern, or a mix of both. In some garmau pregnant fanfiction, the family members play an important role in helping the couple prepare for the baby.
One common theme could be the relationship changes. With the pregnancy, the characters' dynamics might shift in many ways.
One common theme could be the challenges of pregnancy. Since Undyne is a strong character, it might be interesting to see how she copes with the physical and emotional changes that come with pregnancy. Another theme could be the relationship between Undyne and her partner during this time, like how they support each other.
One common theme might be the anticipation and excitement within the family and the community. Since Neytiri is an important character in the Avatar universe, her pregnancy would likely have a big impact on those around her.
One common theme could be the exploration of the unexpected situation of a character like Chucky being involved in a pregnancy - related plot. It might also deal with themes of the supernatural and how it intersects with pregnancy.