Well, in addition to Applejack and Apple Bloom, if the fanfic delves into their family history, there might be other relatives who are related to their mother. These could be secondary characters that help to flesh out the story of their mother and how she was part of the family. But at the core, it's really about Applejack and Apple Bloom and the shadow of their mother in their lives.
One possible interesting storyline could be about the family bond between Applejack and Apple Bloom, and how their mother's influence (even if not directly present) shapes their characters. For example, they might inherit certain values from their mother which are shown through their daily activities on the farm.
One common theme could be her learning important life lessons. As she grows up, she might face challenges in friendship, like dealing with differences among her friends. Another theme could be her discovery of her own talents. For example, she could find out she has a special gift for farming or taking care of animals, which she hadn't fully realized when she was younger.
Maybe some of the older ponies in her family, like Applejack, could be main characters. Applejack could be guiding her, teaching her things about the family business or just sharing life lessons. And through these interactions, Apple Bloom gets closer to finding out what her cutie mark represents.
One major problem is that it might go against the intended nature of the character. Apple Bloom is usually depicted as a young and innocent character, and a pregnancy plotline would be completely out of place and inappropriate for her character arc.
I'm not aware of any specific 'Apple Bloom pregnant fanfiction' that is appropriate. Fanfiction often contains a wide variety of themes, but this particular one might not be very common in a family - friendly or appropriate context.
Some Applejack fanfics might be set in an alternate universe. Maybe in a world where Applejack has to learn a new type of farming technique from a far - off land. This would not only test her adaptability but also show how she can bring new ideas back to her family's farm in Equestria.
Well, perhaps she goes on an adventure that leads to her getting her cutie mark. Maybe she helps out on the farm in a unique way that shows her special talent.
A bloom mother dragon fanfiction could be about the adventures of a mother dragon in a world filled with blooming magical plants. Maybe the dragon is protecting her hatchlings in a forest full of enchanted blooms.
One possible analysis could be that it might explore the journey of Apple Bloom towards getting her cutie mark. It could involve her insecurities, her attempts at different things, and the growth she experiences throughout the story.