One common theme could be the challenges they face as a couple with an impending baby. Maybe dealing with the reactions of their friends and family in the Star Wars universe.
Yes, there are likely some out there. Fanfiction websites are full of creative takes on different storylines. You can try searching on platforms like Archive of Our Own or FanFiction.net.
They might face the challenge of acceptance from their communities. Since they come from different sides, the Resistance and the First Order, there could be a lot of resistance to their union and the upcoming baby. Also, they could struggle with financial and living situation problems if they want to raise the child in a safe environment.
Their friends might be initially shocked. Some of their more cautious friends could be worried about the implications of a child born to such powerful individuals. However, their closest friends would likely be very supportive and offer help in any way they can, like providing a safe place to stay or resources for the upcoming baby.
I'm not sure about specific rey and ben solo pregnant fanfiction titles. You could try searching on popular fanfiction websites like Archive of Our Own (AO3). They have a vast collection of Star Wars - related fanfictions, and you might find what you're looking for there.
You can start by looking on Archive of Our Own (AO3). It has a vast collection of fanfictions. Just use the search bar and type in relevant keywords like 'Ben and Rey pregnant' and it should show you relevant stories if they exist.
One possible storyline could be that they discover the pregnancy unexpectedly. Maybe they are in the middle of some sort of adventure or struggle against a common enemy, and this new development completely changes their priorities and how they interact with each other. They might start to plan for a more stable future, away from the chaos they were previously in.
One plot idea could be that they discover the pregnancy during a time of great unrest in the galaxy. They then have to hide and protect their unborn child from various threats. Another could be that they are on a journey to find a special place where their child will be safe and grow up with unique powers. Maybe they also face some internal struggles within their relationship because of the unexpected pregnancy.
Love and its complexity is a very common theme. Their relationship can be romantic, platonic or a complex mix of both. Also, the struggle between the light and dark side of the Force within them and how they influence each other's choices is frequently explored. In many fanfictions, they are both trying to find a balance between their different natures. For example, in some stories, Rey helps Ben resist the dark side, while Ben helps Rey understand the darker aspects of the Force without being consumed by it. And of course, the theme of destiny and how their fates are intertwined is also quite popular.
One common theme is redemption. Ben's journey towards redemption is often explored in relation to Rey. Another theme is the power of love, how their connection might change the course of the galaxy.