Elena could be an antagonist. Since she has a history with Christian, she might try to interfere with Anastasia's pregnancy, perhaps out of jealousy or a desire to maintain some control over Christian.
She could become more assertive. Since she is going to be a mother, she might start standing up for herself and her unborn child more in her relationship with Christian.
A more elaborate plot could be that Anastasia discovers something unusual about her pregnancy, like a genetic condition that Christian's family has a history of. This would add a layer of drama and conflict as they struggle to come to terms with it and make decisions for the future of their family.
One idea could be exploring how Anastasia and Christian deal with the pregnancy in the context of their complex relationship. Maybe there are doubts and insecurities that surface.
One possible fanfiction could be that Anastasia and Dimitri find out about the pregnancy in a very unexpected way. Maybe they were in the middle of planning their future together, and Anastasia starts feeling unwell. They initially think it's just stress, but when they visit a doctor, they get the big news. Dimitri is overjoyed and becomes extremely protective of Anastasia right away.
Hermione would likely be very curious about Anastasia. She might study her as if she were a new and interesting magical creature. Hermione would probably ask Anastasia a million questions about her Muggle life and try to understand how she thinks.
One great fanfic could be 'A New Beginning for Christian and Anastasia'. It might explore their relationship further after the events in the original story, like how they handle family life together.
A plot could involve them traveling to a special place during her pregnancy. They want to find a safe haven for their soon - to - be family. Along the way, they meet different characters who either help or hinder them, adding more drama and adventure to the story.
One idea could be that Anastasia Steele somehow gets transported into the Harry Potter world. Maybe she has a unique ability that catches the attention of the Hogwarts professors. For example, her tenacity and strong will, which were prominent in her own story, could be seen as a form of magical resistance or inner strength in the wizarding world.
Another way is to join fan communities on social media platforms dedicated to the Fifty Shades series. People there often share and recommend their favorite fanfics. They might even have threads where they discuss the best - written ones in terms of plot, character development, and writing style.