Another plot twist could be that the father of the baby is not who they initially thought. This would create a huge amount of drama and relationship turmoil. It could also lead to a search for the real father and a battle against whoever was trying to deceive them about the pregnancy.
One possible plot twist could be that the pregnancy is not natural. Maybe it was the result of some magical or supernatural interference. For example, a powerful witch cast a spell on them for some unknown reason.
One possible plot twist could be that the father of the baby is not who everyone initially thinks. Maybe there's a secret admirer or an old acquaintance who turns out to be the father. Another plot twist could be related to the safety of the pregnancy. For example, there could be a new threat in the world she lives in that specifically targets pregnant women. Or perhaps, Michonne discovers some special powers or abilities that are awakened during her pregnancy, which is completely unexpected and changes the course of the story.
A great plot twist could be that the pregnancy is not as straightforward as it seems. There could be some sort of magic or curse involved that changes the nature of the baby as it develops. For example, the baby could start to show signs of being a different species than expected. Also, what if there are other characters who want to claim the baby as their own for power or some other ulterior motive? This could lead to a lot of conflict and drama in the fanfiction.
Another idea is that the fanfiction could be a dark, alternate universe story where Jasper has turned evil. His reasons for kidnapping Bella could be tied to some sort of revenge plot against the Cullens. He might hold a grudge against them for something that happened in the past, and Bella is just a means to get back at them. This would create a very different dynamic compared to the original Twilight story.
One possible plot twist could be that a long - lost relative of Bella shows up and tries to stop the wedding because they have some dark secret about the Cullens. Another could be that a new vampire coven arrives and challenges the Cullens right before the wedding, forcing Bella and Jasper to postpone it while they deal with the threat. Maybe there's also a twist where Bella discovers a new power within herself on her wedding day that changes the whole dynamic of the relationship with Jasper and the Cullen family.
One possible plot twist could be that the pregnancy is not a normal one. Maybe there are some special powers or abilities that the baby inherits which causes all kinds of chaos and challenges. For example, the baby could have the power to manipulate time like Alice, but it's out of control in the womb and affects the flow of time around them.
Well, a plot twist could be that the baby has some unexpected powers. Since Klaus is a hybrid and Elena has her own unique connection to the supernatural world, the baby could inherit a combination of powers that no one has seen before. It could also be that Elena discovers she's pregnant but then loses the baby due to some dark magic, which leads to Klaus going on a rampage. Then, later, it turns out the baby is still alive but has been hidden away by a secret group who wants to use it for their own ends.
The plot twist could be that Kol and Davina find out that the pregnancy is part of a prophecy. However, the prophecy has been misinterpreted by many. They initially think it's a good thing, but as they dig deeper, they realize that there are dark forces at work trying to use the baby for their own evil purposes. So they have to fight against these forces to protect their unborn child and their future together.
One possible plot twist could be that they initially think they are having one baby but find out it's twins. This would add an element of surprise and more challenges for them in the story.
One possible plot twist could be that they face opposition from their respective families or groups. Maybe Ahsoka's Jedi Order is against it due to their code. Another could be that there are complications during the pregnancy that force them to seek help from unlikely sources. For example, they might have to turn to an old enemy who has medical knowledge.