Well, they would become even closer as they are about to be parents. Edward would be extremely protective of Bella, not just because she's his love but also because she's carrying their child.
One idea could be the challenges Bella faces during the pregnancy, like dealing with her changing body in a unique vampire - human hybrid way. Maybe she has super - strong cravings that are related to both human and vampire desires.
Yes, there might be such fanfictions out there. Fanfiction often explores alternative storylines. However, this goes against the original 'Twilight' series canon which pairs Bella with Edward and has different family relationships.
This kind of fanfiction concept is really out - of - the - box. If Bella is pregnant with Aro's baby, it might introduce a new power or a new type of vampire - human hybrid. The story could focus on the pregnancy itself, like how Bella copes with the physical and emotional changes. It could also show how the baby might grow up in a world full of vampires and werewolves, and what kind of impact it would have on the existing power balance in that fictional universe.
One common theme is the struggle with identity. Bella is no longer just human or a new vampire, but a pregnant vampire which is a whole new identity. Another theme is family. The Cullen family's reaction and support (or lack thereof in some cases) play a big role.
One popular aspect in 'bella has a vampire baby fanfiction' is the exploration of the unique nature of the baby. Since it's part vampire, it might have extraordinary powers or characteristics. For example, it could grow at an accelerated rate or have super strength. The relationship between Bella and the baby is also a key point. Bella, as a mother, has to deal with the challenges of raising a half - vampire child in a world full of danger and secrecy.
One common theme is the struggle for acceptance. The half - vampire baby is different from both humans and regular vampires, so it has to find its place in the world. Another theme is protection. Bella and her family must protect the baby from those who might want to harm it. And there's also the theme of the unknown. Since this is a unique situation, no one really knows what the future holds for the baby.
One possibility is that there would be a huge rift between Bella and the Cullens. Since Edward was her previous love interest, this new situation would be extremely difficult for them to accept. And it would also make the Cullens' relationship with the Volturi even more complex.