Well, a plot could revolve around Blair being pregnant and deciding to focus on herself and her unborn child instead of getting caught up in the usual power plays. She could start to re - evaluate her relationships, like with Serena, and they could either grow closer as Serena supports her through the pregnancy or have some conflicts as their lives start to take different paths.
Chuck Bass could be a likely candidate as they have a long and complicated relationship in the show. Their on - again, off - again dynamic would add a lot of drama to the story if he were the father.
One popular Blair Waldorf pregnant fanfic might be 'A New Chapter for Blair'. It could explore how her pregnancy changes her relationships within the Upper East Side clique. Another could be 'Blair's Maternity Journey' which might focus on her personal growth during pregnancy.
You can try fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and there's a good chance you'll find Blair Waldorf pregnant fanfics there.
Another plot could be about them starting a family. The difficulties of pregnancy, raising children, and how they balance their busy lives with their new family responsibilities. There could be drama with in - laws and different parenting styles, but in the end, their love for each other and their family prevails.
There could be a plot where Blair and Soul get transported to a different dimension. They have to find a way back home while adapting to the new and strange environment. Along the way, they meet new characters and form unexpected alliances.
One idea could be exploring how Yugi's friends react to the news. Some might be shocked, while others could be extremely supportive. Another could be the challenges Yugi faces during the pregnancy, like dealing with morning sickness and hormonal changes.
One idea could be that Lucy's pregnancy is unexpected and she has to deal with the reactions of her friends and family. Some might be overjoyed while others are worried. Another could be a story where the father of the baby is a mystery and Lucy goes on a journey to find out who it is. Maybe she discovers some secrets about her past relationships along the way.
One idea could be exploring how the other Transformers react to Megatron in this unexpected state. Maybe some are shocked, while others see it as a chance for a new beginning in the ongoing conflict.
One plot idea could be how Morrigan copes with the physical and emotional changes during pregnancy while still having to deal with her usual duties or challenges in the story world. Maybe she has to hide her pregnancy from certain characters for some reason.
One idea could be focusing on how Naruto and Hinata prepare for the baby. Naruto might be excited yet a bit nervous about being a father, while Hinata is calm and starts knitting baby clothes. Another could be about their friends' reactions. Sakura could be giving Hinata pregnancy advice, and Kakashi might be secretly happy for them.