Themes in such fanfiction can be quite diverse. There could be a theme of self - discovery for both Viktor and Hermione during the pregnancy. They might learn more about themselves as individuals and as a couple. Also, the theme of family heritage can play a role. For example, how their combined magical lineages will affect the baby's abilities. And sometimes, the theme of secrecy might be there, as they may choose to keep the pregnancy a secret for a while for various reasons, which then leads to all sorts of plot developments.
One common theme is the adjustment of their relationship. With Hermione being pregnant, they have to deal with new responsibilities and a deeper level of commitment. Another theme could be the reactions of their friends and the wizarding community. Some fanfictions might explore how Harry, Ron and others respond to this unexpected situation.
Often, there are themes related to the challenges of having a child in the wizarding world. This includes things like magical education for the unborn child, and how to protect the family from potential dark forces. In some 'viktor and hermione pregnant fanfiction', the theme of cultural differences also comes up, considering Viktor is from a different wizarding culture than Hermione.
One common theme is cultural exchange. Since Viktor is from Bulgaria and Hermione is from the UK, many fanfics explore how they share their different magical traditions. Another theme is the underdog love story. Hermione is often seen as an outcast in some ways at Hogwarts, and Viktor is an outsider in the Triwizard Tournament, so their relationship can be seen as two outsiders coming together.
One common theme is the idea of protection. Viktor, being a strong and capable wizard, often protects Hermione from various threats, whether it's from dark wizards or the judgmental eyes of the wizarding society. Another theme is cultural exchange. Viktor, coming from Bulgaria, brings his own cultural elements into their relationship, which Hermione finds fascinating. For example, he might introduce her to Bulgarian magical traditions.
One common theme is cultural exchange. Since Viktor is Bulgarian and Hermione is British, fanfics often explore how they share their respective cultures with each other. Another theme is the idea of an alternative relationship. In the original books, Hermione ends up with Ron, so these fanfics offer a different romantic path for her. Also, there's often a theme of acceptance, both from their friends and the wider wizarding community who have to get used to their unexpected union.
One common theme is the struggle against prejudice. Since Viktor is from Durmstrang and Hermione is a Gryffindor at Hogwarts, they often face discrimination from different sides due to their relationship.
I'm sorry I can't directly recommend specific 'viktor and hermione pregnant fanfiction' as it may vary a lot in different fanfiction platforms. But you can start by searching on popular fanfiction websites like Archive of Our Own. Just use the search terms 'viktor and hermione pregnant' on their search bar, and you may find a good number of relevant stories.
Hermione's friends from Hogwarts like Harry and Ron might be a bit shocked at first. Ron, in particular, might have some mixed feelings as he has had a bit of a competitive streak with Viktor in the past. But eventually, they would come around and support her. Viktor's friends from Durmstrang would probably be more accepting as they might respect his choice more blindly. They could be excited for him and offer their own unique magical gifts or knowledge for the upcoming baby.
One idea could be that they face challenges from their different magical cultures. For example, Hermione's friends from Hogwarts might be initially skeptical of Viktor due to his Durmstrang background. Another could be that they discover new magic related to pregnancy that has been long forgotten. Maybe they find a spell that can communicate with the unborn child's magic even before it's born.
Another theme is the reactions of their friends. In many fanfictions, Harry, Ginny, and other friends play important roles, either by providing support or adding some comical relief to the situation. For example, they might throw a baby shower or give parenting advice. And it also often includes the theme of preparing for the new life, like setting up a nursery and choosing baby names.
One common theme could be the reaction of the wizarding community. Since Percy and Hermione are from different social and academic circles within the Harry Potter universe, how others in the community react to their relationship and the pregnancy can be a big part of the story.
One common theme could be redemption. Severus has a dark past in the original series, and a pregnancy with Hermione could be seen as a chance for him to redeem himself and become a better person. Another theme might be the power of love and how it can transcend the boundaries set by society or their own personalities.