Another option is Wattpad. Although it has a more diverse range of content, there are still some interesting Hermione and Cedric fanfictions on there. You might need to do a bit more searching compared to the other two platforms, but it can be worth it as you may find some unique takes on their relationship.
Archive of Our Own is a great place to start. It has a large and diverse collection of fanfiction, and it's likely to have some stories about Cedric loving Hermione.
Some Tumblr blogs also share fanfictions. You could search for tags related to 'Cedric and Hermione married' on Tumblr. However, the content there can be a bit scattered, so it might take some time to sift through. Also, be aware that not all the stories will be of high quality, but with a bit of patience, you might discover some great ones.
You can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions, including Cedric Harry slash ones. Just use the search function and type in relevant keywords to find what you're looking for.
You can also try looking on Wattpad. Although it's known more for original stories, there are also fanfictions available there. Just use the search bar and type in 'Edward is Cedric Diggory' and see what comes up. However, the content on Wattpad might be a bit more diverse in terms of quality compared to the other two platforms.
Another great place is Archive of Our Own (AO3). It has a wide variety of fanfiction, including many that focus on Cedric Diggory's love stories. The tagging system there makes it easy to filter and find exactly what you're looking for.
Another option is Wattpad. Although it has a wide variety of content, you can find some unique 'Harry Potter Cedric Fanfiction' there. It might take a bit more searching compared to AO3 or Fanfiction.net, but it's worth a look as you may discover some hidden gems.
You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can search for 'Harry and Cedric' there. Many talented writers share their works on it.
Fanfiction.net is also a good place. There are a lot of Harry Potter fanfictions on this site. You might need to dig a bit deeper by using specific tags like 'Cedric Diggory' and 'Harry Potter' in combination with something related to love or relationship to find the ones you want.
Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfictions, and you can use the search function to specifically look for 'Harry and Cedric mpreg' stories.
The contrast between Hermione's studious nature and Cedric's more popular and athletic image makes for an interesting dynamic in fanfiction. Writers can play with this contrast, showing how they might initially clash but then find common ground. Maybe Cedric helps Hermione come out of her shell in social situations, while Hermione helps Cedric with his studies in a more complex area of magic.