A more dramatic plot idea could be that there are some health scares during the pregnancy. This would put a strain on their relationship as they deal with the fear and uncertainty. But through it all, they grow closer and learn more about each other's strengths and weaknesses.
One plot idea could be that they initially struggle to balance their busy careers with the impending arrival of the baby. They might have to make tough decisions about who takes time off work and how they'll manage childcare in the future.
In a Josh and Donna fanfic, if Donna is pregnant and single, it could lead to a lot of interesting character development. She could be shown as a strong and determined woman. For example, she might struggle at first with the news but then decide to embrace it and focus on building a good life for her and the baby. It could also create some tension in her relationship with Josh, whether it's an old flame rekindled or a friendship that's put to the test because of her situation.
One possible plot could be that Donna discovers she's pregnant after a short - lived relationship that didn't work out. She decides to keep the baby and is now facing the challenges of single motherhood. Meanwhile, Josh, who still has feelings for her, is trying to figure out how to support her without overstepping boundaries.
One idea could be that Josh and Nora travel to a new town where they discover a hidden community of other supernatural beings. They have to decide whether to join this community or keep their distance. Another could be that Nora gets a job at a hospital where she has to deal with a co - worker who is secretly investigating her and Josh's strange behavior. A third idea is that they plan a trip to a place from Nora's human past, and along the way, they face various challenges that test their relationship.
A more complex plot could be that there is a powerful ancient curse that starts to affect all supernaturals in the area. Aiden and Josh have to team up with other 'Being Human' characters to find the origin of the curse and break it. They would face many obstacles along the way, including internal conflicts within the group due to different species' instincts.
You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, including 'The West Wing'. Just search for 'West Wing Josh Donna pregnant' on the site, and you might find what you're looking for.
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.