A possible theme could be the medical aspects if it's set in a more realistic universe. How they take care of their health during the pregnancy, doctor visits, etc. Another could be the social stigma or acceptance within their community if it's a story where such things matter. It could also be about the journey of self - discovery during this unique time in their lives, like realizing new strengths or weaknesses.
One possible theme could be the challenges they face during the pregnancy. It might explore how their relationship changes as they deal with the situation. Another theme could be the reactions of the people around them, like their families and friends.
One common theme is friendship. Their bond is often explored, like how they rely on each other in difficult times.
I'm not sure about a specific 'Jacob and Seth pregnant fanfiction'. You could try searching on popular fanfiction websites like Archive of Our Own. They usually have a wide range of fanfictions and you might be able to find something related to Jacob and Seth there.
Friendship is a very common theme. Since they are both part of the same pack, a lot of fanfictions explore how they form a strong friendship, like in 'Friendship Forged in Fur'.
One popular theme is friendship. Fans like to explore how Jacob and Seth's friendship grows and evolves. It could be them bonding over protecting the tribe or just sharing their thoughts about the strange things that happen in Forks. For example, in many fanfictions, they have heart - to - heart conversations about their werewolf nature.
A common theme is loyalty. They are both part of the pack and their loyalty to each other and the pack is often explored. Another theme is growth, like how they grow as individuals and as members of the pack.
One common theme could be the exploration of their relationship dynamics. It might show how they get to know each other on a deeper level, their initial attractions, and how they overcome any obstacles in their relationship.
Perhaps the theme could be about breaking social norms, since male pregnancy is not a common occurrence in real - life scenarios. It might also explore themes of acceptance, both self - acceptance and acceptance from others around the characters.
One common theme could be the challenges they face as a couple during the pregnancy. Another might be how their families and friends react to the news. Also, the anticipation and preparation for the new arrival could be a theme.
In this fanfiction, the theme of discovery could be prominent. Seth might discover the hidden world of Twilight through being saved by Alex. Also, the theme of loyalty could play a part. As Alex saves Seth, Seth might feel a sense of loyalty towards Alex, and they could support each other through different trials in the fan - created Twilight - inspired world.
Another theme could be the loss of innocence. At 15, a girl is still a child in many ways, and pregnancy can suddenly thrust her into a very adult situation. This could be explored in terms of how she copes with the loss of her carefree youth.