There could be. Fanfiction is a very diverse world where fans can explore different scenarios. In the case of 'Naruto Gets Kushina Pregnant', it's a rather unorthodox idea considering the original Naruto story's timeline and relationships. But in fanfiction, writers can bend the rules. You can search on popular fanfiction platforms like FanFiction.net or Archive of Our Own to see if such a story exists.
In this kind of fanfiction, Naruto might have to deal with a whole new set of powers and instincts. He would likely struggle with the urge to consume human flesh, which is a huge contrast to his usual values. Maybe he'd try to find an alternative way to survive, like the vegetarian ghouls in Tokyo Ghoul. His ninja skills could also be combined with his new ghoul abilities in interesting ways, for example, using his enhanced strength and speed from being a ghoul in combat while still relying on his ninja techniques like shadow clones.
One potential storyline could be Naruto having to re - experience his early life with his new - found child self's perspective. He might struggle with the lack of strength he once had as an adult. For example, he could have trouble with basic ninja training again, but this time with the knowledge of his future self, which could lead to some interesting twists. Another could be how his relationships change. His friends might initially not recognize him and he has to prove his identity in a rather comical way. And also, the villains might underestimate him as a child, which could be a great advantage for Naruto to outwit them.
Well, in such a fanfiction, Naruto would probably be really cute as a baby. His friends might be super confused at first. Sasuke might be a bit less brooding towards baby Naruto. And Iruka-sensei would probably take on a more parental role, making sure baby Naruto is safe and cared for.
One alternate storyline could be that Naruto is taken in by someone unexpected, like a group of outcast ninjas. They teach him different values and skills, leading to a Naruto who has a more unorthodox approach to being a ninja. Another could be that Naruto, in his search for answers about why Kushina abandoned him, discovers a dark secret about his family that changes his entire perspective on the ninja world.
One possible plot could be an alternate universe where time and events are distorted. Maybe some time - travel or magic is involved that leads to Naruto being in a situation where he could get Kushina pregnant. It would be a very strange and complex plot, considering Kushina is Naruto's mother in the original story.
Another aspect could be that the fanfiction delves into how Kushina's presence affects Naruto's relationships with others. For instance, his relationship with Sasuke could be different. With a strong maternal figure in his life, Naruto might be more stable emotionally and be able to approach Sasuke in a more understanding way, which could potentially change the whole dynamic of their rivalry and friendship.
Perhaps Naruto would become more in - touch with his Uzumaki heritage. With Kushina being an Uzumaki, she could pass on some unique knowledge or abilities to him. He might also start to explore the history of the Uzumaki clan more deeply, which could open up new storylines and alliances within the Naruto universe.
It could change the family dynamics completely. For example, Naruto's story as we know it might be very different. Instead of growing up an orphan, he could have a very different upbringing with both his parents around. Also, it could affect the power balance in the village as Naruti and Kushina's combined power and influence would be different with a family to consider.
There are likely fanfictions out there. Fan authors often like to explore different aspects of the characters' lives. A positive fanfiction about Kushina's pregnancy could also involve her friends and family in the village helping her out during her pregnancy. Maybe they bring her special foods or tell her stories about their own families. It could be a heartwarming tale that shows the community spirit in the village.