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.
One common theme is redemption. Ben Solo's journey towards redemption and how Rey is involved in it is often explored. For example, many stories show Rey as the guiding light for Ben to turn away from the dark side.
The power of the Force connection between them is another big theme. Writers often play with how their bond through the Force can be used to defeat enemies or solve problems.
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.
The exploration of the Force bond is also very common. Writers often use this unique connection between Ben and Rey to create intense and emotional scenes. They might show how they can communicate through the bond or even share powers.
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.
One common theme is family. It shows how Rey and Ben create a family unit with their baby. Another theme is love. Their love for each other deepens as they care for their baby.
Love and redemption are common themes. Their marriage often represents a new start for both, a chance to leave behind their past mistakes and be better. Another theme is the merging of two different worlds. Rey coming from a more humble background and Ben from a more complex, troubled one.
Themes in 'Star Wars Ben and Rey fanfiction' often include the struggle between light and dark. Their relationship can be seen as a microcosm of this struggle within the Star Wars universe. Another theme is the discovery of self. Through their interactions, both Ben and Rey learn more about who they are. And of course, the theme of hope is prevalent. Their bond gives hope for a better future in the galaxy, which is a very Star Wars - like concept.
Common themes include the idea of hope and new beginnings. With the pregnancy, it symbolizes a fresh start for Finn and Rey in a world that has seen so much chaos. Also, there's often the theme of facing fears. They might be afraid of being good parents or worried about the safety of the baby in a dangerous galaxy, and the fanfiction shows how they overcome these fears.