Yes, there are likely some 'Lois Lane pregnant' fanfictions in the Smallville fandom. Fanfiction writers often explore different scenarios, and a pregnancy for Lois Lane is an interesting plot point that can add drama, character development, and new storylines. However, the quality and content can vary greatly among different fanfictions.
A frequent theme is the support system around Lois. It could be about her family, like her father's reaction, or her friends in Smallville. Also, the theme of anticipation and preparation for the baby is common. How Lois and those around her get ready for the new addition to their lives, from setting up a nursery to emotional preparations.
Well, without more information about Lucy Lane's scary stories, it's difficult to be very specific. However, perhaps she has stories about cursed objects. For example, a doll that seems to move on its own at night, with its eyes following people around the room, and strange events start to occur to those who come in contact with it.
One thing that might make Lucy Lane's scary stories unique could be her use of setting. If she often sets her stories in very ordinary places like a small town grocery store or a local park, it can make the horror feel closer to home.
In many of these fanfictions, a theme of mutual support and growth is present. Kara might help Lucy understand the world of superhumans better, and Lucy could support Kara in dealing with her human side. Also, the theme of discovery, both of each other's true selves and of their feelings, is quite common. They start as acquaintances or even rivals perhaps, and then gradually realize their love for each other through various events and interactions.
You can try websites like Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can easily search for Kara Danvers and Lucy Lane love stories there. Fanfiction.net is also a popular option. Just use their search functions to look for specific pairings.