Well, it could start out very tense. Ramsay is cruel and Sansa is a victim. But with the presence of a baby, Ramsay might start to show some unexpected softness towards Sansa. He may not be as violent as he used to be towards her.
Often, these fanfictions involve a re - imagining of their relationship. They might give Ramsay a more redeemable quality, which is different from his cruel nature in the original story. For Sansa, her strength and growth are usually emphasized as she navigates this new relationship.
One common theme is survival. Given Ramsay's brutality, Sansa often has to fight for her life, either physically or psychologically. For example, in many fanfictions, she uses her knowledge of courtly intrigue to stay alive. Another theme is power struggle. Ramsay wants power over Sansa, and she resists, leading to a constant back - and - forth.
Sansa would likely become more determined and resourceful. The pregnancy would force her to think not just about her own survival but also about the life growing inside her. She'd have to be stronger to face Ramsay's madness.
One challenge could be Sansa's mental state. After all the trauma she's been through with Ramsay, being pregnant by him could lead to extreme psychological distress. Another challenge could be the reaction of the people around them. The Northmen, for example, would likely be horrified at the thought of Sansa having Ramsay's child. And Ramsay himself might see the child as another tool for his sadistic games, creating a dangerous situation for Sansa and the unborn baby.
One common theme is survival. Sansa has to find ways to survive Ramsay's brutality. Another theme is power struggle. Ramsay has power over Sansa, and she tries to regain some sort of control. Also, there's the theme of redemption in some fanfictions where Ramsay might show a glimmer of humanity or Sansa finds a way to forgive, though this is less common given Ramsay's character.
There might be some out there that are more appropriate. Some fanfictions might focus on the psychological and emotional aspects of Sansa's situation without delving into inappropriate content. You could try searching on family - friendly fanfiction platforms.
One possible plot could be a story where Sansa manages to escape Ramsay's clutches before any harm comes to the baby. Maybe she finds allies within the castle who help her flee with the baby to a safe place, like a hidden forest village.
One great Sansa and Ramsay fanfiction is 'A Different Path'. It explores an alternate universe where Sansa manages to outwit Ramsay in a more psychological battle rather than a physical one. The author does an excellent job of delving into Sansa's character growth in the face of Ramsay's cruelty.
Sansa could grow in terms of her resilience. The pregnancy in such a terrible situation with Ramsay would force her to become stronger. She would have to find ways to protect not only herself but also the unborn child, which could lead to a more hardened and strategic Sansa.