Many fanfictions use the trope of 'supernatural complications'. Since they are in the Supernatural universe, there could be other forces that either try to harm Dean because of the pregnancy or are interested in the unborn child for their own purposes. This adds an element of danger and adventure to the story, like in 'Perilous Pregnancy' where they have to fight off demons who want to use the baby for dark magic.
One common trope is the 'fish - out - of - water' situation for both characters. Castiel, being an angel, is not used to the concept of human pregnancy, and Dean has to deal with a very non - traditional male pregnancy. Another trope is the over - protective Castiel, like in many stories where he goes to great lengths to keep Dean safe during the pregnancy.
The 'secret - keeping' trope is also quite common. Dean might be hesitant to tell others in the Supernatural world about his condition, fearing their reactions. And there's often the trope of the 'unexpected bond' that forms between them during this time, strengthening their relationship in ways they didn't expect, as seen in stories like 'The Unforeseen Bond' where they discover new aspects of their feelings for each other.
Chapter 513, "A Public Stage", is the clearest early answer because it turns Jiang Shixu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Everyone was sharing their experiences in a few words, the banter...
Chapter 573, "You Are Already Ugly Enough", is the clearest early answer because it turns Sister Yue's situation into a concrete plot event. The chapter turns that into something concrete by moving from Social work was the major I switched to for balance, my minor is in...
Chapter 586, "She Just Likes Men Who Show Weakness Initiative", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 408, "You Can't Be on the Same Team!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zheng Xun fell silent after he understood the situation.
Chapter 577, "Cat and Mouse Game", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Chen Manman also agreed with what Luo Xuan said. and ending on What is this?" Guo Xing looked at the odd name..
Chapter 462, "I Will Definitely Be a Good Captain!", is the clearest early answer because it turns Shiguang's situation into a concrete plot event. It opens with Inside the practice room, Tai Fan had been staring blankly with the... and closes on He was meant to be dead weight!.
Chapter 405, "The Person Saved Casually Turns Out to Be a Diplomat?!", is the clearest early answer because it turns Dean Yu's situation into a concrete plot event.
Chapter 771, "Just Friends", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. The chapter gives readers a real answer by opening on Su Yinwan had lost five million followers in less than a week.
Chapter 577, "Cat and Mouse Game", is the clearest early answer because it turns Team's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Chen Manman also agreed with what Luo Xuan said. and follows through with No, we can't eliminate them right away..
Chapter 416, "Such a Sensitive Nose, Born in the Year of the Dog?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Yu Li's words successfully choked Lady Nina.