Well, perhaps Bella decides to move away to a new place to start fresh with her baby. She could meet new friends who help her through the difficult times. Meanwhile, Edward might start to have second thoughts and try to come back into her life, but Bella has to decide if she can forgive him. This can create a lot of drama and character development in the fanfic.
One idea could be that Bella has to raise the baby alone at first, but then she discovers some hidden powers within herself because of the pregnancy. Another could be that the Cullen family, despite Edward leaving, secretly keeps an eye on Bella and the baby, leading to some tense and emotional encounters.
In this fanfic, Bella could struggle with the idea of whether to tell her family about the pregnancy. She might be afraid of their reaction. At the same time, the baby could start to show some extraordinary abilities early on. As for Edward, his leaving could be due to some dark secret he's afraid will endanger Bella and the baby. But as the story progresses, he realizes he made a huge mistake and tries to make amends in a very difficult situation.
A really interesting plot twist could be that Bella's pregnancy progresses at an extremely fast rate, and the baby has powers that allow it to communicate with Bella and Edward telepathically even before it's born. This causes them to reevaluate their relationship and what they thought they knew about vampires and half - vampire children.
One possible plot twist could be that the twins have some sort of special power. Maybe they can communicate telepathically from the womb, which causes Bella to have strange visions and Edward to sense something unusual even though he's left. Another could be that Bella discovers a hidden family secret about her own lineage that is related to the twins and their potential abilities. This could lead her on a journey of self - discovery while dealing with the pregnancy alone.
One interesting fanfiction could be where Edward leaves Bella for a different reason than in the original story, like he believes he's putting her in danger from a new vampire threat. This could lead to Bella having to prove she can handle the situation on her own.
One idea could be that Bella already has some latent vampire powers herself when she meets Edward. Maybe she can sense other vampires from a distance. This would add a new dynamic to their relationship as they both figure out what it means.
One idea could be Bella starts spending a lot of time with Jacob, and she makes sure Edward sees them having fun together, like going on hikes or working on Jacob's car. Another could be that Bella flirts with a new vampire in town in front of Edward.
One possibility could be that Bella has to face the challenges of pregnancy alone. She might struggle with the physical and emotional changes while also dealing with the absence of Edward. The Cullen family could be in a dilemma about whether to support her or not, as Edward's departure might have left them with mixed feelings. And Bella could start to discover new powers or abilities within herself as she copes with the pregnancy, which could be a big part of the fanfiction plot.
She might first be in shock. Then, she could turn to her friends like Jacob for support. Jacob, being protective, would likely try to help her in any way he can, whether it's providing for her basic needs or just being there to listen to her fears and concerns.
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.
It could be that there are external forces at play. Maybe there are other characters or some kind of dark secret in the fanfiction lore that forces Edward to leave Bella while she's pregnant. For example, there could be a threat from a rival group that says they'll harm Bella and the baby if Edward stays, and he thinks leaving will draw the danger away from them.
In such fanfiction scenarios, Bella's pregnancy while Edward is gone often sets the stage for intense character development. She might become stronger and more independent, or it could bring out hidden vulnerabilities. It also creates a lot of tension and anticipation about whether Edward will return and how things will unfold.