Yes, there might be some. You can try looking on fanfiction websites like Archive of Our Own or FanFiction.net. Just search for 'rtte astrid pregnant' and you may find relevant stories.
A possible plot could be that Astrid discovers she's pregnant at a crucial time in the 'rtte' world, like during a conflict or a big mission. She has to keep it a secret for a while because she doesn't want to be sidelined. As the pregnancy progresses, she faces various difficulties like morning sickness during important events, and there's a struggle within herself about whether to continue with her dangerous dragon - riding lifestyle or take a step back for the sake of the baby. Meanwhile, her relationship with Hiccup might be tested as they both navigate this new chapter in their lives.
Their relationship would likely become more tender. Hiccup would be more protective of Astrid, always making sure she is safe and comfortable. Astrid, on the other hand, might be more reliant on Hiccup during her pregnancy.
A fanfic that stands out is 'When Astrid Fell'. Here, Astrid has a serious fall during a training session. The writer delves deep into her emotions as she struggles with her injury. It also shows how her friends, especially Hiccup, support her through the tough times.
One possible plot idea could be that they discover Astrid is pregnant and they start preparing for the baby. Hiccup might be a bit nervous at first but then becomes super excited. They could face challenges like how to keep the village safe while also getting ready for the new arrival.
Fanfiction.net is another good place. There are many talented writers who post their RTTE Astrid hurt fanfictions there. Browse through the How to Train Your Dragon section and look for the specific tags related to Astrid being hurt.
One possible fanfiction could be about how Hiccup and Astrid deal with the pregnancy. Hiccup might be overprotective, constantly worried about Astrid and the baby. Meanwhile, Astrid could be trying to keep up with her normal Viking duties while also preparing for motherhood. And the lemon element could be a symbol in the story, perhaps it's something Astrid craves during her pregnancy, leading to some humorous or heartwarming scenes between her and Hiccup as he tries to find the perfect lemon for her.
One thing to keep in mind is that the quality of fanfictions can vary greatly. When you find some 'Astrid pregnant' fanfictions, read the reviews and summaries carefully. Some might be really well - written and explore interesting storylines, while others might not be up to your taste. You can also try to filter the search results based on the ratings and number of reviews on the fanfiction platforms.
One idea could be to focus on how Astrid and Hiccup prepare for the baby. They might start building a new addition to their home on Berk. Hiccup could be super protective, while Astrid is determined to still be involved in dragon - related activities as much as she can until she can't anymore.
One common theme could be the relationship changes. For example, how her partner reacts to the news of her pregnancy. Another theme might be her own self - discovery during this new phase of life.