There may or may not be Shiro x Pidge pregnant fanfiction. It depends on how popular the pairing is within the fan community and whether any writers have been inspired to create such a story. Some fanfiction writers might be more interested in exploring other aspects of their relationship rather than this particular plotline.
A possible plot is that they are on a diplomatic mission when Pidge realizes she's pregnant. Shiro is worried about how this will affect their mission and Pidge's health. But they decide to continue the mission while also taking extra precautions. As the pregnancy progresses, they face challenges like dealing with other planets' cultures that have different views on pregnancy. They also have to deal with their own insecurities about becoming parents, especially Shiro who has had a lot of responsibility already.
Fanfiction.net could also be a place to check. However, the tagging system there might not be as detailed as on Archive of Our Own. But still, it's worth a try. Another option is to join relevant fan groups on social media platforms like Facebook or Reddit. Members might be able to point you in the right direction if they know of any such fanfiction.
For Shiro, his development could be shown through his growing sense of protectiveness. He goes from being a fearless leader to being extra cautious for the sake of Pidge and the unborn baby. He might start to take on more domestic tasks, which is new for him. Pidge could develop in her ability to accept help. Usually so independent in her scientific pursuits, she now has to rely on others more. This could also make her more empathetic towards others in similar situations.
A common theme is mutual understanding. Shiro is often portrayed as a strong leader, and Pidge as a brilliant mind. Their fanfictions usually show how they come to understand each other's strengths and weaknesses. For example, Shiro might learn to appreciate Pidge's unorthodox thinking in battle strategies.
Well, for starters, the age difference between Shiro and Pidge in the original series might pose a challenge. You need to handle it delicately in the fanfiction so that it doesn't seem inappropriate. Additionally, their different roles within the Voltron team mean they have different priorities and responsibilities. Incorporating a romantic relationship without disrupting the overall dynamic of the team is no easy feat. And then there's the matter of pacing. You have to build up their relationship gradually so that the kiss doesn't feel forced or out of place.
In the world of Voltron, Pidge and Shiro were constantly side by side. Pidge always had a special place in her heart for Shiro. She would often blush when he praised her work. Shiro, though focused on the greater mission, couldn't help but be charmed by Pidge's quirks. It started with small gestures, like Shiro saving Pidge a seat at meetings or Pidge making sure Shiro had his favorite food. Over time, their feelings became deeper. They found themselves seeking each other out for comfort during tough times, and it was clear that love was blossoming between them.
A lot of Shiro x Pidge fanfictions explore the idea of mutual support. Shiro being the leader and Pidge being the tech - savvy one, they can support each other in different ways. For example, Shiro might rely on Pidge's technical skills during a tough situation, and Pidge might look up to Shiro for his leadership. There are also themes of sacrifice, where one of them is willing to sacrifice for the other in the face of danger.
Love and commitment are common themes. Since they are getting married, the fanfics often explore how deep their love is and their commitment to each other through different situations.
One common theme is the exploration of their different personalities coming together. Shiro is often seen as the strong, reliable leader, while Pidge is the brilliant and curious tech - genius. Their relationship in these fanfictions can be about how they support and understand each other on a deeper level.