One common theme is family. It often focuses on how Supercorp (Supergirl and Lena Luthor) build a family around their baby. Another theme is the challenges they face in raising the baby while dealing with their superhero/villain identities.
There's 'Unlikely Allies'. In this fanfiction, Supercorp's dynamic is shown in a unique way as they are forced to work together against a common enemy that threatens both their worlds. It has a great plot that keeps you on the edge of your seat. Also, 'The Promise' is quite popular. It delves deep into their feelings, especially Lena's struggle with her own identity while being in love with Supergirl.
Love and support are very common themes. The stories often show how the two characters in supercorp support each other through the pregnancy, which is really heart - warming.
One popular Supercorp fanfiction is 'The Future We Deserve'. It beautifully weaves a story where Lena and Kara's relationship develops in a post - apocalyptic world. Another great one is 'Hearts Aligned' which focuses on their emotional journey as they face challenges together within the Supercorp universe. And 'Soulmates in the Shadows' is also well - liked as it delves deep into the unspoken connection between the two characters.
One great Supercorp Lena pregnant fanfiction is 'Lena's New Chapter'. It beautifully portrays Lena's journey through pregnancy while dealing with the challenges in her relationship with Supergirl. The story focuses on the emotional growth of the characters.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of supercorp fanfictions and you can sort them by popularity, kudos, or bookmarks. Another option is FanFiction.net, which also has a good number of stories.
I think Tumblr can also be a useful place to look for supercorp baby fanfiction. There are many Supercorp fans on Tumblr who create and share fan content. You can use relevant tags like'supercorp' and 'baby fanfiction' to search through the posts and find some interesting reads.
The theme of self - discovery also pops up. When they are in a hurt - comfort situation, they often learn more about themselves. For instance, Lena might discover that she is stronger than she thought when she has to be the one to comfort Kara during a difficult time. And Kara might realize that she can rely on Lena in ways she didn't expect, which helps in her own character growth.
There's also 'Supercorp: The Pregnant Adventure'. In this fanfic, it focuses on how the couple deals with the challenges that come with the pregnancy, like preparing for the baby and facing the reactions from their friends and family. It's quite an engaging read.