One idea could be them preparing for the baby. Like Jake going overboard with baby-proofing their apartment, and Amy making detailed schedules for everything from doctor appointments to baby classes. Another could be their friends' reactions. For example, Charles being overly excited and constantly bringing them baby gifts.
A plot could revolve around the mystery of who the father is, if it's not immediately obvious. This could lead to some drama and speculation among the characters. Or it could be about her journey of self - discovery during pregnancy. She might learn new things about herself, her strength, and her capacity to love. Maybe she also has to deal with changes in her relationships because of the pregnancy.
One idea could be that Sonic and Amy face challenges in preparing for the baby while still dealing with their usual adventures. For example, Sonic might have to slow down a bit, which is really hard for him as he's always on the go. Another plot could be that their friends in the Sonic universe all come together to help them get ready, like Tails building special baby gear.
One plot idea could be that Amy has to deal with the challenges of her pregnancy while still taking care of the horses at Heartland. Maybe she discovers a new training method during this time that she wants to implement but has to wait until after the baby is born. Another idea is that she could face some initial doubts from her family and friends about her ability to balance motherhood and her work at Heartland, but she proves them all wrong as she progresses through her pregnancy.
One idea could be that Amy and Jake have to solve a mystery in their neighborhood. They could start by interviewing neighbors and finding strange clues. Another could be a time - travel plot where they end up in a different era and have to adapt while still maintaining their relationship. Maybe they could also go on an undercover mission together where they have to pretend to be a different couple to catch a criminal.
One plot idea could be exploring how Amy deals with the physical and emotional changes during pregnancy while also facing some danger from an old enemy. Maybe she has to rely on her wits more than ever to protect herself and her unborn child.
One plot idea could be Amy trying to balance her pregnancy with her detective work. Maybe she's determined to solve a big case before going on maternity leave and has to deal with the overprotectiveness of her colleagues, especially Jake. Another could be the hilarious baby shower preparations at the precinct, with everyone having different and comical ideas about how to celebrate.
In some fanfictions, Sonic and Amy's pregnancy could be a result of a magical accident. They then have to learn how to be parents quickly. Sonic, who is used to being on the go all the time, has to slow down and be more responsible. Amy, on the other hand, is overjoyed but also a bit worried about how Sonic will adjust. They both grow closer as they prepare for the arrival of their baby.
One possible plot idea could be exploring how they prepare for the new arrival. They might start building a new and safer home within the Hometree or in a special place in Pandora. Another idea could be how they deal with the reactions of the tribe. Some may be excited and supportive, while others might be worried about potential changes. Also, they could face challenges like finding the right food and resources for the pregnancy.
One idea could be exploring how Yennefer deals with the physical and emotional changes during pregnancy while still being a powerful sorceress. Maybe she has to find a way to protect her unborn child from the many enemies she has made.
One idea could be exploring how she and her partner (like Percy) adjust to the news. They might have to deal with the reactions of their friends and family. Another could be the challenges she faces during the pregnancy, like her still wanting to be involved in heroic adventures but having to be more cautious.