One possible plotline could be the family's reaction. The Weasley family is large and close - knit, so they would likely be very excited and supportive. There could be scenes of them preparing for the new baby, like knitting baby clothes or setting up a nursery. Another plotline might involve Audrey dealing with the physical and emotional changes of pregnancy while also managing her daily life in the wizarding world.
One plotline could be that Ginny is pregnant and she overhears a conversation where someone she trusts is speaking ill of her pregnancy or making plans that would be harmful to her unborn child. This would be a huge betrayal as she thought they were on her side.
One possible plotline could be Ginny trying to hide her pregnancy from her friends and family at Hogwarts. She might be worried about the reactions and how it would affect her studies and her standing in the wizarding world. Another could be that she decides to confide in a few close friends, like Hermione, who then help her navigate the difficult situation while also dealing with the regular Hogwarts adventures. Maybe there's a mystery surrounding who the father is, adding an element of intrigue to the story.
One common plotline is the journey of Hermione and Ron (assuming she's married to Ron in the fanfic) as they prepare for the baby. It might involve them decorating the nursery, choosing baby names, and dealing with the excitement and nervousness of impending parenthood.
In some fanfictions, there might be a plotline where Fleur discovers she has some sort of special power or connection because of her pregnancy. It could be that she can sense things in the wizarding world more acutely, like danger approaching the family. And then there's the plotline of how Fleur and Bill handle the news of the pregnancy. Do they keep it a secret at first? Or do they immediately share it with the family? There are so many ways this can be explored in fanfiction.
One possible plotline could be Percy finding out he has cancer and having to deal with the reactions of his family. Some might be overly protective, while others might struggle to accept it. Another could be Percy supporting a family member with cancer, showing his growth and change from his more uptight self in the books.
One possible plotline could be that Tinkerbell's pregnancy is a magical accident. Maybe she was exposed to some strange magic that caused this unexpected situation. Another could be that she is in love with a fairy or a character from the Peter Pan universe and they are starting a family together.
One possible plotline could be how Nami and the other Straw Hat crew members react to her pregnancy. Maybe they would be overly protective or excited. Another could be about Nami dealing with the physical and emotional changes during pregnancy while still being part of the crew's adventures.
One possible plotline could be Ursula dealing with the challenges of pregnancy while still maintaining her powerful and devious nature. For example, she might use her pregnancy to her advantage in some scheme against her enemies.
A plotline could involve Mulan's partner and how they support her during the pregnancy. It could also show how Mulan's pregnancy impacts her relationships with the people she has met during her previous adventures. Maybe there are some who are skeptical or some who are very supportive. Also, the story could explore how Mulan prepares for the arrival of the baby in the context of the world she lives in, whether it's the military - based world she was a part of or her family - centered village life.
One possible plotline could be a character accidentally getting pregnant and then having to deal with the reactions of their friends and family. For example, in a 'Victorious' context, a main character like Tori might find herself in this situation and struggle to balance her normal life, like school and her performing career, with the new reality of pregnancy.