Well, a plot could revolve around Bella's pregnancy being a sign of a greater change in the vampire - human relationship in the fanfiction world. Her pregnancy could be seen as a miracle by some and a curse by others. The Cullens might have to deal with other vampire clans who either want to study the pregnancy or stop it out of fear. Meanwhile, Bella is just trying to have a normal pregnancy as much as possible. She could start documenting her experiences in a journal, which later becomes a crucial element in the story, either to help other hybrids in the future or as evidence of the unique bond between her and Edward.
A great plot idea is Bella exploring her newfound powers during pregnancy. Since she's already had some unique experiences as a human in a vampire - filled world, pregnancy could enhance or bring out new abilities. Maybe she can communicate with the unborn child in a special way that no one else can understand. This could lead to some interesting scenarios where the baby gives her clues or warnings about upcoming events. Also, the family could be divided on how to handle these new developments, some seeing it as a great opportunity while others as a potential danger.
One idea could be exploring how Bella's pregnancy affects her relationships with the Cullens more deeply. For example, how Rosalie, who has always wanted a child, might react in a more complex way than just initial acceptance. Another could be Bella's struggle with her new physical state and how she copes with the changes in her body while still trying to maintain a sense of normalcy in her relationships.
One idea could be that Bella discovers she's pregnant unexpectedly and has to deal with the shock while Phil is away on a business trip. She then has to figure out how to tell him. Another plot could be that they both plan for a pregnancy but face difficulties like family opposition. For example, Bella's parents might not think Phil is ready to be a father.
Well, perhaps in the fanfiction, Bella discovers some unique powers during her pregnancy that are related to the kingdom's magic. And King Edward has to protect her from those who might want to use her and the baby for their own gain. Also, they could have a series of adventures together as they prepare for the arrival of their baby, like exploring ancient ruins to find baby - related artifacts.
A plot could revolve around Carlisle and Bella going on a secret mission together. Maybe they have to find a lost ancient vampire artifact that could change the future of the vampire world. Along the way, they develop a deep bond and respect for each other.
Perhaps they go on a journey to find out more about their relationship's origin. They might travel to different vampire clans around the world to seek answers, facing all kinds of adventures and challenges along the way, and in the process, their bond grows even stronger.
One idea could be exploring how Yennefer deals with the physical and emotional changes during pregnancy while still being a powerful sorceress. Maybe she has to find a way to protect her unborn child from the many enemies she has made.
One idea could be exploring how she and her partner (like Percy) adjust to the news. They might have to deal with the reactions of their friends and family. Another could be the challenges she faces during the pregnancy, like her still wanting to be involved in heroic adventures but having to be more cautious.
One idea could be exploring how Gwen's friends and family react to the news. Some might be overjoyed while others could be worried. Another plot could involve Gwen dealing with the physical and emotional changes during pregnancy while also trying to maintain her normal life, like her hobbies or job. And a third could be about the father's role, if known, and how their relationship evolves during this time.
A plot could revolve around Kushina having premonitions about the future of her unborn child during her pregnancy. She might have dreams that she tries to interpret, and this could add an element of mystery. Also, it could be interesting to see how her pregnancy affects her ninja duties, if she has to take a break or if she finds new ways to contribute while pregnant.
One idea could be exploring how Kairi's friends react to the news. For example, Sora might be initially shocked but then become extremely protective. Another plot could revolve around Kairi preparing for motherhood while still dealing with the challenges in her world. Maybe she has to find a safe place to raise her child away from the ongoing battles.