The plot might involve Harry trying to figure out how he got pregnant in the first place if it's in a world where male pregnancy is not the norm. He could be alone because he doesn't want to burden his friends or family. Harry would then have to learn about pregnancy on his own, from reading books or searching the internet. He might also face financial difficulties as he prepares for the baby's arrival, but through his own determination and some unexpected help, he starts to build a new life for himself and the baby.
The story could be that Harry grows up alone in the Muggle world, completely unaware of his wizarding heritage until much later. He might face bullying and isolation in the Muggle school. When he discovers his true identity, he has to quickly adapt to the wizarding world all by himself. This could lead to him making some hasty and unwise decisions as he has no one to guide him.
Perhaps Sakura is alone as a result of a broken relationship. She finds out she's pregnant and has to make a decision about whether to keep the baby or not. If she decides to keep it, she starts to build a new life for herself and the unborn child. She might learn new skills, make new friends who support her during the pregnancy, and gradually become more confident in her ability to be a single mother.
One possible plot could be that Harry and Ginny are overjoyed at the news of Ginny's pregnancy. They start preparing for the baby's arrival by setting up a nursery in their home at Grimmauld Place. Ginny might take a break from Quidditch, and Harry would be extra protective, constantly worrying about her safety. Their friends like Hermione and Ron would be excited and offer their help, bringing baby clothes and giving advice based on what they've read in wizarding parenting books.
One possible plot development could be the initial shock and confusion from both Draco and Harry. They would have to deal with the reactions of their friends and the wizarding community. Another could be the struggle to find a way to handle the pregnancy in a world where male pregnancy is unheard of, perhaps seeking out rare magic or potions. Maybe there would be a plot where they have to keep it a secret from their enemies who could use this strange situation against them.
One possible plot could be that there is a dark magic experiment in which Harry is an unwilling participant. Snape, who is initially part of the experiment in some way, realizes the implications and leaves. Harry is left pregnant and has to navigate the stigma associated with such an unheard - of situation in the wizarding community. He may seek help from Hermione and Ron, who are initially shocked but then support him. Along the way, Harry could discover secrets about his own magical abilities related to this pregnancy that no one knew before.
One possible plot could be that during an encounter with a basilisk, some sort of dark magic or a strange magical accident occurs. This magic somehow causes Harry to become pregnant. Harry then has to deal with the shock and secrecy of this situation while also trying to figure out how to reverse it or what it means for his future in the wizarding world.
Hermione could be one of the characters to help Harry. She's intelligent and resourceful, so she could provide practical help like finding a good doctor or helping with magic - related pregnancy issues if it's in a magical world. Another could be Hagrid. He has a big heart and could offer emotional support and perhaps a place for Harry to stay if he needs it.
Well, in this kind of fanfiction, a plot development could be that Ginny, being pregnant, discovers new magical abilities or powers related to motherhood. This could be a unique take on the story. Also, the wizarding community might react in different ways to Ginny's situation. Some could be supportive, while others might shun her because of Harry's departure. It could lead to Ginny having to fight for her place in the community and prove that she can be a great mother on her own terms.
Maybe the story could focus on Harry trying to find a way to reverse the situation. He could go on a quest to find some ancient magic or a powerful wizard who might be able to help. There could also be a plot where the Ministry of Magic gets involved, either trying to cover it up or use it as a weapon against Voldemort. And of course, there would be the internal struggle for Harry, dealing with his own feelings about Voldemort and this unexpected pregnancy.
One possible plot development could be that Harry has to face the challenges of being a young father while still dealing with his wizarding duties. He might struggle to keep his family safe from the dark forces that are always lurking in the wizarding world.