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 that Emmett and Bella face unexpected challenges during the pregnancy. Maybe the vampire - human pregnancy has some unique medical issues that they have to deal with. For example, Bella's body might react in strange ways because of the baby's half - vampire nature.
A possible plot could be that Bella and Elijah are from different species in the fanfiction world, for example, one is a vampire and the other a werewolf (assuming such a scenario exists in this fanfic). Their pregnancy is then a very unique situation that defies the norms of their world. This could lead to a lot of drama, with different factions either trying to protect or harm them because of the baby. They would have to rely on each other and a few trusted friends to navigate this new and dangerous situation.
One idea could be that they face challenges from their families. Maybe Bella's family is initially shocked and has to come to terms with the situation. Another could be that they have to deal with the gossip in their small town. For example, people might spread rumors about how it all happened so quickly.
One idea could be exploring how the pack reacts to Bella's pregnancy. Maybe some are protective while others are worried about the implications for the pack. Another could be the relationship between Seth and Bella as they prepare for the baby. Seth might be overjoyed and extremely helpful.
Perhaps a plot where they try to find a way to ensure the baby has a normal life. They might search for ancient vampire or human lore that could help. It could also be interesting if they face external threats during the pregnancy, like other vampire covens who see the baby as a threat or an opportunity.