One common theme is the anticipation and excitement of becoming parents. It often shows Jake and Rose shopping for baby things, choosing names, etc. Another theme could be the fear and anxiety that comes with the pregnancy, especially if it's unexpected.
There are quite a few Jake and Rose pregnant fanfictions. You can start by looking on popular fanfiction websites like Archive of Our Own. Some might focus on how they deal with the pregnancy, the reactions of their friends and family, and the changes it brings to their relationship.
Another storyline could be set in a fantasy world where Aria and Jake are from different magical races. Their pregnancy is a big deal as it could bring about a new era of peace between their races. However, there are dark forces that try to stop the baby from being born. So they have to go on an adventure to protect their unborn child, facing various magical creatures and obstacles along the way.
A common plot is their struggle to be together despite their opposing roles. Jake is a dragon and Rose is a Huntsgirl after all. Another one could be them teaming up against a common enemy, which then deepens their bond.
One possible plot could be that Jake and Arce are in a relationship. They discover Arce is pregnant unexpectedly. Jake might initially be scared but then decides to step up and be there for Arce. They could face challenges like family reactions or financial difficulties while preparing for the baby.
Often, there could be themes related to the challenges they face. Maybe there are issues regarding the acceptance of their relationship by others in their fictional world, and how the pregnancy affects that. Another theme could be the protection of the unborn child, with Jake and Nessie having to face potential threats. It also might touch on the emotional journey of the characters as they experience the joys and fears associated with impending parenthood.
In the fanfiction, Rose's pregnancy could be a catalyst for the Doctor to finally settle down in one place for a while. Maybe they find a peaceful planet where they can build a home and prepare for the arrival of the baby. Their friends from their adventures might come to visit and offer their support. It could also lead to some interesting cultural clashes as they combine their different upbringings and knowledge to raise the child.
The plot could revolve around Marley and Jake deciding how to balance their Glee club activities with the impending arrival of the baby. They might worry about how their pregnancy will be received in the school community. There could be a sub - plot where they face some judgment from other students or even some of the more conservative teachers. But they stay strong and use their music to express their feelings about the pregnancy, creating a special performance in the Glee club dedicated to their unborn child.
You need to create a vivid setting for the story. If it's in a modern - day city, describe the hustle and bustle around Jake and Arce as they deal with the pregnancy. Maybe they visit different doctors, baby stores, etc. Also, use dialogue effectively. Let Jake and Arce have heart - to - heart conversations about their future and the baby, which will draw the readers in.
It could also develop with some tension. For example, if Jake is not ready for the pregnancy, there could be some arguments between them. But through these tough times, they learn more about each other and grow closer. They start to communicate better and by the end of the pregnancy, their relationship is stronger than ever.