I'm not sure of a specific title right off the bat, but you can try searching on fanfiction platforms like Archive of Our Own. Look for tags like 'Hermione', 'Arthur', and 'pregnancy'. You might find some hidden gems there. There could be some where the pregnancy is a result of a magical accident or a new spell gone wrong, which makes for an interesting plot.
One great Merlin and Arthur pregnant fanfiction is 'The Unlikely Miracle'. It's really interesting as it explores how the Camelot court reacts to such an unexpected situation. The author does a wonderful job of staying true to the characters' personalities from the original series.
One great Hermione Granger and Arthur Weasley fanfiction is 'The Unlikely Bond'. It shows a unique relationship where Hermione helps Arthur with some Muggle - related projects at the Ministry. It's really interesting to see how their different perspectives, Hermione's vast knowledge and Arthur's love for all things magical, come together in the story.
One interesting Hermione pregnant time travel fanfiction is 'Time's Unexpected Gift'. In this story, Hermione travels back in time while pregnant and has to navigate the past while protecting her unborn child. It's full of mystery and emotional moments.
The theme of family and legacy often comes up. Arthur, being from the Weasley family, has a certain legacy. Hermione, coming from the Muggle - born world, also has her own values. The pregnancy makes them think about the kind of family they want to create. There are also themes related to magic and how it can be used to ensure a healthy pregnancy in the wizarding context, like special spells for prenatal care.
One great Hermione and Ron Weasley pregnant fanfiction is 'The Next Chapter' which beautifully portrays their journey into parenthood. It shows how they deal with the excitement and nervousness. Another is 'Family Beginnings' where the author focuses on Hermione's pregnancy cravings and Ron's attempts to satisfy them in the most hilarious ways.
One great Arthur Pendragon hurt fanfiction is 'The Wounded King' which delves into his emotional turmoil after a major battle. It shows his struggle to regain his strength both physically and mentally.
I really like 'A Female Merlin's Quest'. In this fanfiction, the female Merlin is portrayed as a strong and independent character. She uses her magic to help Arthur in different ways, and their bond is both platonic and filled with mutual respect. The author does a great job of creating a believable world within the Arthurian setting.
There's a fanfic called 'A New Chapter for Harry and Hermione'. In this story, their marriage is a result of years of growing closer after the battle. The pregnancy part is written very realistically, showing Hermione's strength and Harry's supportive role. It also includes their friends' reactions, which add a lot of warmth to the story.
There may be some, but it's not a very widespread theme. Most fanfictions tend to focus on more common pairings or plotlines. However, in the niche corners of the fanfiction community, there could be a writer or two who have explored this idea. You could start by looking on large fanfiction websites and using specific search terms to see if anything comes up.
I'm not sure about a very specific one, but you can check out Archive of Our Own (AO3). There are tons of fanfictions related to this. Just type in 'Journalist Arthur Magic Merlin' in the search bar, and you'll get a list. You might find some real gems there that explore different aspects of this unique concept, like how Arthur's journalistic skills help him in a world filled with Merlin's magic.