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.
Perhaps Sakura is in a dangerous or complex political situation. If she is a prominent figure in a fictional world, her pregnancy could be used against her. So she hides it to protect herself and her unborn child. She might have to deceive those around her, including her closest allies, which could lead to a lot of internal conflict and tension in the story.
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.
It could be an old flame that Sakura had a brief encounter with. Maybe it was a relationship that ended suddenly, and now she's left alone with the pregnancy.
One possible plot could be that Sakura discovers she's pregnant and she has to balance her duties as a ninja with her pregnancy. Naruto is super excited but also worried about her safety. They face challenges from the outside world, like enemies who might see Sakura's pregnancy as a weakness to target.
One possibility is that Naruto realizes Sakura has feelings for Sasuke that he can't change, so he decides to focus on his own ninja journey alone and leaves her to figure out her relationship with Sasuke. He might feel that his presence is only causing confusion or getting in the way of her true feelings.
Well, a plot could revolve around Sakura sharing her pregnancy journey with her friends. Ino could be there to give her advice on motherhood. And as for Sarada, it could explore how she anticipates the arrival of her sibling. Maybe she's a bit jealous at first but then grows to be really excited.
One possible plot could be in a fantasy world where a spell gone wrong results in a character having a 'pregnant belch'. This belch could be like a living entity that the character has to deal with, leading to all sorts of misadventures as they try to find a way to reverse the spell. However, this is a very out - there concept.
Well, one possible plot could be Percy facing his inner demons in Tartarus. Since he's alone, he might have to rely solely on his own skills and memories. Maybe he'll encounter some long - forgotten monsters that test his strength and willpower. He could also stumble upon some hidden secrets about the place that no one has ever known before.
Perhaps the plot could involve a misunderstanding. Gaara is sent to capture or subdue Sakura because she's suspected of something she didn't do. Sakura, of course, won't go down without a fight. She tries to reason with Gaara at first, but when that fails, she attacks. The fanfic could then explore how they gradually learn the truth during the fight. Gaara might start to respect Sakura's tenacity and Sakura might understand Gaara's loyalty to his village better.
Maybe Itachi, despite his stoic nature, starts to have an unexpected soft spot for Sakura. He could be secretly protecting her during her missions, which might lead to some tense and mysterious moments as Sakura tries to figure out who her mysterious protector is.