One idea could be Mary dealing with the social expectations during her pregnancy. For example, how she has to uphold the family's reputation while her body is changing. Another could be her relationship with her husband evolving as they prepare for the baby. Maybe he becomes overprotective or they have small disagreements about parenting styles even before the baby is born.
The plot could involve Mary Crawley's pregnancy being a surprise to those around her. There could be drama as she decides who to tell first, like her family or her husband. And then there could be a series of events related to her preparing for the baby, such as dealing with the arrangements in the house, and the reactions of the servants. Also, there might be some conflict with other characters who have different opinions on how she should handle the pregnancy.
Well, it depends on the fandom community. There are many fanfics out there, and while there could be one about Mary Crawley being pregnant, it might not be that easy to come across. Some fanfic authors might be interested in exploring such a storyline for Mary Crawley, but it's not guaranteed to exist in a widespread or easily found form. You'd really have to dig into the relevant fanfic archives and communities to know for sure.
One idea could be that Mary and Bash face challenges from the court regarding their pregnancy. Maybe there are rumors spread to undermine their position. Another could be that they have to deal with health scares during the pregnancy, which brings them closer together.
One idea could be exploring how Peter Parker deals with the new responsibility while still being Spiderman. He might have to balance protecting the city and taking care of his pregnant wife. Another could be Mary Jane's own journey during pregnancy, like her concerns about bringing a child into a world full of danger.
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.
One idea could be exploring how Gwen's friends and family react to the news. Some might be overjoyed while others could be worried. Another plot could involve Gwen dealing with the physical and emotional changes during pregnancy while also trying to maintain her normal life, like her hobbies or job. And a third could be about the father's role, if known, and how their relationship evolves during this time.
A plot could revolve around Kushina having premonitions about the future of her unborn child during her pregnancy. She might have dreams that she tries to interpret, and this could add an element of mystery. Also, it could be interesting to see how her pregnancy affects her ninja duties, if she has to take a break or if she finds new ways to contribute while pregnant.
One idea could be exploring how Kairi's friends react to the news. For example, Sora might be initially shocked but then become extremely protective. Another plot could revolve around Kairi preparing for motherhood while still dealing with the challenges in her world. Maybe she has to find a safe place to raise her child away from the ongoing battles.
Well, a great plot could be that Natasha discovers she's pregnant right before a big mission. They then have to decide whether she'll still go on it or not. Steve is all protective and wants her to stay back, but Natasha being Natasha, she has her own ideas. And as the pregnancy progresses, they could start to have different dreams for their child's future - Steve hoping for a normal life and Natasha seeing potential for another little superhero in the making.