Another theme could be how their friends react to the news. In 'Friends', their group of friends is very close, so the reactions of Joey, Phoebe, Ross, and Rachel would likely be a big part of the fanfiction. Maybe some of them are overly excited, while others are a bit more cautious.
One common theme could be the anticipation and excitement of becoming parents. For example, they might be shown preparing the nursery or discussing baby names.
The challenges that come with pregnancy could also be a theme. Things like Monica's nesting instincts getting out of control or Chandler worrying about being a good father. There could also be moments of humor, like Chandler making his typical sarcastic comments about the whole situation, which are characteristic of their relationship in the show.
Mondler is a really cute couple from 'Friends'. For their pregnant fanfiction, another option could be to join dedicated 'Friends' fan groups on Facebook. People often share their own fan creations there. But keep in mind that the availability of such specific fanfiction depends on how many fans have been inspired to write about this particular scenario. It could be that there are only a few out there, or there could be a whole collection waiting to be discovered.
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.
Often, there's a theme of family and support. Like how their friends and family react to the pregnancy, and how that impacts the spamano relationship. Maybe their families are overjoyed or there are some difficulties in getting support. Another theme could be the future plans of the couple. Are they thinking about getting married? How will they raise the child? There can be a lot of speculation and development around these ideas in the fanfiction.