Perhaps it could involve a relationship she has with another character in Bioshock. If she is pregnant, the father of the child could be someone important in the Bioshock lore. This could lead to a story about how they react to the news, and how they plan for the future in a world as dangerous as Rapture. It could also explore how the pregnancy affects her scientific work and her role in the Rapture society.
One possible plotline could be that Tenenbaum discovers she is pregnant during the chaotic events in Rapture. This could add an extra layer of complexity to her already difficult situation of trying to deal with the fall of Rapture and the moral dilemmas she faces. She might have to make choices about the safety of her unborn child while also trying to help others.
I'm not sure specifically about 'Bioshock Tenenbaum pregnant' fanfiction. However, to find good fanfiction in general for Bioshock, you can check out popular fanfiction websites like Archive of Our Own. They have a large collection of Bioshock - related fanfics, and you might be able to find something that involves Tenenbaum in different storylines.
One possible plotline could be about how Starfire adjusts to her new state. She might face challenges like dealing with her powers while pregnant. For example, she could worry if her powers would harm the baby. Another could be the reactions of her friends and teammates. They might be overprotective or have to adapt to her new limitations. And there could also be a plot about who the father is and his role in the pregnancy journey.
Another plotline could be set in a time where society has certain expectations of them because of the pregnancy. They could be facing pressure from their families or the upper - class society that Tewksbury is a part of. Enola, being the independent thinker she is, might rebel against some of these expectations while Tewksbury tries to find a balance between pleasing his family and standing by Enola. This could lead to a series of interesting events and character developments within the fanfiction.
One possible plotline could be that Pansy is in a secret relationship with someone at Hogwarts, and the pregnancy is a huge shock to her and her partner. They then have to deal with the consequences, like how to hide it from other students and teachers, and what their future might hold.
A plotline could revolve around the emotional journey she goes through. Yoko is known for her tough exterior, but pregnancy might make her more vulnerable. She could be struggling with fears and insecurities, not just for herself but for the life she's bringing into the world. There could also be a story where she forms new alliances or relationships because of her pregnancy, as others come to support her or have ulterior motives related to the unborn child.
Perhaps the story could focus on Nike's journey through the pregnancy. She could be worried about how motherhood will change her relationship with Livius. And Livius might be trying to prove himself as a worthy partner and future father, like getting a better job or a more stable place to live for their future family.
One possible plotline could be that it's a surprise pregnancy. Belarus might initially struggle with how to handle it, especially considering her role in the Hetalia world. She could be worried about how other nations will react, and there could be a lot of internal conflict as she decides whether to keep the baby or not.
One possible plotline could be that they are forced into an unexpected situation where they have to deal with the pregnancy together despite their differences. Another could be that it's a result of some magical or mysterious event that binds them in this situation, and they must navigate their new relationship while also dealing with the reactions of the Avatar world.
One possible plotline could be the challenges they face in their relationship due to the unexpected pregnancy. Maybe their families react in different ways, creating drama and tension.
One possible plotline could be the two characters initially being in shock and then having to figure out how to break the news to their families and friends. Another could be them facing opposition from certain factions who don't approve of their relationship. Maybe they have to go on the run to protect their unborn child.