Yes. In the world of fanfiction, the sky's the limit. Writers can take the characters of Kylo Ren and Rey and develop their relationship in various ways, including a scenario where they are pregnant. This could add a whole new layer of drama and intrigue to their story, exploring how they would deal with such a situation in the context of the Star Wars universe, like how the Force might be involved in the pregnancy or how their respective factions would react.
One interesting Rey and Kylo Ren fanfiction could be about an alternate universe where they team up much earlier to fight a new threat in the galaxy. This could explore their relationship in a different light, without the initial enmity.
There is a fanfiction called 'Rey and Kylo's New Beginning' where they manage to defeat the ultimate evil together and then decide to rebuild the Jedi and Sith teachings in a new, more harmonious way. They end up falling in love and bringing peace to the galaxy.
One possible plot could be that they initially keep it a secret from both the Resistance and the First Order. They might try to find a safe haven away from the ongoing conflict to protect their unborn child. As the pregnancy progresses, they could face internal struggles. For example, Rey might worry about the child inheriting Kylo Ren's dark side tendencies, while Kylo Ren could be conflicted about how to raise a child in a world full of war and power struggles.
One idea could be a fanfiction where Kylo Ren and Rey team up not just to defeat a common enemy in the traditional sense, but also to reform the broken Jedi and Sith orders. They could travel to different planets to find ancient knowledge that could help them create a new, more balanced way of using the Force.
Their relationship develops through a series of challenges. They face external threats together, which forces them to rely on each other. This cooperation gradually chips away at their initial hostility. In some fanfictions, there are also moments of self - discovery for both characters within the context of their relationship. Kylo Ren might realize his true desires beyond power, and Rey might discover new aspects of the Force through their connection.
The pregnancy could bring out a more protective side in both of them. Kylo Ren might become less consumed by his power - hungry ways as he focuses on protecting Rey and the baby. Rey, on the other hand, might soften towards Kylo Ren even more, seeing him as the father of her child. Their relationship could transform from a tumultuous one to a more stable and loving partnership as they navigate the challenges of impending parenthood.
There are likely other characters from the First Order. For example, General Hux. His rivalry with Kylo Ren and his own ambitions within the First Order contribute to the overall plot. Also, characters from Kylo Ren's past, like his parents Han Solo and Leia Organa, are important even if they may not be as present in the novel as in other parts of the Star Wars saga, but their influence on him is still a big part of his story.
Their relationship could develop into a rivalry that is not based on the light and dark sides of the Force. For example, they could be competing for the position of the most powerful Force user in a neutral galactic academy. This would lead to a lot of intense battles and power struggles, but also mutual respect as they recognize each other's skills.
In many fanfictions, the romance between them is often a slow - burn. It starts from their initial enmity and gradually evolves. Their shared experiences, like the battles they fight together, contribute to their growing bond. The idea that they could potentially redeem each other is also a common theme. Rey might be the one to bring Kylo Ren back to the light, and in the process, their feelings for each other deepen.