The plot could start with Finn and Rachel having a big fight. Then, they find out about the pregnancy which completely changes the dynamic. They have to go through the normal pregnancy experiences like doctor visits, baby shopping, etc. together. Along the way, they might rekindle their relationship. Rachel could start writing songs about the baby and their future, and Finn could be her biggest supporter, and they look forward to becoming parents.
One possible plot could be that Rachel and Finn are newlyweds. They find out about the pregnancy unexpectedly. At first, they're scared but then start to get excited. Finn might start working extra hours to save for the baby while Rachel has to deal with her Broadway dreams on hold. They could face some judgment from friends or family who think they're too young, but in the end, they come together stronger, ready to welcome their new family member.
In a fanfiction, perhaps Rachel is in the middle of an important audition for a big role when she discovers she's pregnant. Finn is over the moon but Rachel is conflicted. She doesn't want to give up her career opportunity. They then have to navigate through this difficult situation. Finn tries to convince her that they can make it work, that she can still pursue her dreams even with a baby. Eventually, Rachel realizes that having a family with Finn is also a big part of her dream.
In the fanfiction, Finn could face challenges in his career as he wants to be there for Rachel during the pregnancy. He might have to turn down some offers that require him to be away for long periods. Rachel, on the other hand, may initially think that the pregnancy is the end of her Broadway dreams. However, as time goes on, she could find ways to combine motherhood with her career. For example, she could start a musical project about pregnancy and motherhood, which could attract a whole new audience.
I'm not sure about the absolute best, but some popular authors in the Glee fanfiction community might be good places to start. You could look for authors who have a high number of views and positive reviews on fanfiction platforms. For example, some authors who have been writing Glee fanfiction for a long time and have a deep understanding of Finn and Rachel's characters are likely to create great stories.
One interesting Finn Hudson and Rachel Berry fanfiction could be where they reunite after a long time apart. Maybe Finn has been traveling and he comes back to find Rachel on the brink of stardom. They rekindle their old feelings and have to navigate their new lives while still holding on to their past love.
Well, one possible plot could be that Rachel Berry discovers she's pregnant unexpectedly. She might initially be in shock and struggle with how to tell her friends and family. Maybe she's worried about how it will affect her career dreams. For example, if she has big Broadway aspirations, she could fear that the pregnancy will put a halt to her progress. She then has to deal with the reactions of those around her, like Finn who could be the father, and they have to decide together what to do about the future.
Perhaps in the fanfiction, Rachel is wrongly accused of stealing a valuable prop from the theater. She was just borrowing it for inspiration but there's a misunderstanding and she ends up getting arrested. Then she has to fight to prove her innocence.
One possible plot is that the baby's father is someone unexpected. And Rachel has to deal with the reactions of her friends and family. She might also face challenges in her career because of having a baby at a certain point in her life. For example, some directors might be hesitant to cast a new mother. But Rachel, being the determined person she is, tries to prove that she can handle both motherhood and her acting career.
One possible plot could be that Rachel and Finn are newlyweds and they are adjusting to life with a new baby. They face challenges like sleepless nights and financial stress, but their love for each other and the baby helps them get through. For example, Finn might take on extra jobs to support the family while Rachel takes care of the baby at home and still tries to pursue her dreams of getting back into performing.
In this fanfiction, it could start with Rachel realizing she is pregnant. Will is initially shocked but then becomes very supportive. They decide to keep the pregnancy a secret for a while to avoid unnecessary attention. As the pregnancy progresses, they start preparing for the baby in small ways, like secretly buying baby clothes. However, they eventually have to tell their closest friends, who have a mix of reactions, some are overjoyed while others are worried about how it will change their dynamic as a group. Throughout the story, Rachel and Will's relationship deepens as they face this new chapter in their lives together.
One possible plotline could be Rachel dealing with the reactions of her friends and family. They might be shocked at first but then come around to support her. For example, her friends could throw her a baby shower, which would be a really heartwarming part of the story.
It could also be Jesse St. James. Given their past history and the complex relationship they've had, it's possible that in a fanfic he could be the father. Maybe they had a brief encounter that led to the pregnancy.