There could be a fanfic where Chloe gets pregnant by accident with Oliver in Smallville. At first, they are both shocked and a bit scared. But as time goes on, they start to see it as a new beginning. Oliver might have to face his own fears about being a father, while Chloe could be worried about how her pregnancy will affect her work or her friendships in Smallville. Eventually, they grow closer as they anticipate the arrival of their baby.
One possible plot could be that they face challenges from their families. Maybe Oliver's family has certain expectations for him and the baby, and Chloe's family is worried about her future. Another aspect could be how they balance their superhero/vigilante activities with preparing for the baby.
The plot could be that Chloe and Oliver have a secret relationship in Smallville. One day, Chloe realizes she's pregnant. They then have to decide whether to keep it a secret or tell their friends. Their friends in Smallville, like Clark, might have different reactions. Some could be supportive, while others might be skeptical about their relationship and the pregnancy. As the pregnancy progresses, Oliver and Chloe face challenges such as dealing with Chloe's health issues during pregnancy and preparing for the baby's arrival.
Maybe a story where they discover the pregnancy in an unexpected way. Like, they were on a mission together and Chloe starts feeling unwell. After some tests, they find out she's pregnant. Then it could be about how they break the news to their friends and family in Smallville. Lois might be overly excited and Clark could offer his support in a very Clark - like, selfless way.
Definitely Clark. He has always been a central figure in Smallville. His friendship with Chloe and his acquaintance with Oliver make him a natural addition. He could offer his super - strength to help protect Chloe during her pregnancy if needed, and also give Oliver some advice on being a good partner and father based on his own values.
Clark might be initially shocked but then very supportive. He would probably offer his help in any way he could, given his own experiences with dealing with extraordinary situations. Lois might be a bit more outspoken, giving Chloe advice on motherhood and also teasing Oliver about becoming a dad. Tess could see it as an opportunity to use their situation to her advantage in some way, but eventually come around to being supportive.
One idea could be that they face challenges in their relationship due to the unexpected pregnancy. For example, Oliver might worry about how his vigilante life could affect the baby and Chloe. Another could be that they go on a journey to find a safe place for their family, away from the threats in Smallville. They could also have to deal with the reactions of their friends and family, some of whom might not be as supportive as they hoped.
I'm not sure of specific fanfics on this topic. But you can try searching on fanfiction - dedicated websites like Archive of Our Own or FanFiction.net. Just type in 'Smallville Chloe pregnant with Oliver' in their search bars, and you might find some great reads.
One way is through communication. Oliver realizes his mistake and sincerely apologizes to Chloe. They sit down and talk about what led to the situation, and Chloe forgives him. Another way could be that Oliver has to go through some sort of redemption arc. He does heroic deeds to make up for what he did to Chloe, like saving her from a real danger.
One popular one might be those that focus on how Chloe's pregnancy changes her relationships within the Smallville universe. For example, how it affects her friendship with Clark. Another could be a fanfic where her pregnancy is a central plot point in a mystery storyline, perhaps related to some strange happenings in Smallville that seem connected to her unborn child. And there could be fanfics where Chloe's pregnancy is a catalyst for her to discover new powers or abilities, adding a unique twist to the story.