Yes, there might be some out there. You can check fanfiction websites like Archive of Our Own (AO3). There are a large number of fan - created stories in the My Hero Academia fandom, and it's possible to find one with this particular pairing and plot. Just use the search function on the website and type in relevant keywords like 'Bakugou x Uraraka pregnant' to narrow down your search.
One common theme is friendship. Many fanfics explore how Bakugou and Uraraka can form an unlikely friendship. Despite their different personalities, they find common ground and support each other's growth as heroes.
A theme could be about the reactions of their friends and family. For example, how Bakugou's explosive personality might handle the situation and how Uraraka's more gentle nature might influence their approach. Also, it could be about how the pregnancy changes their relationship dynamics, like growing closer or having some initial conflicts due to the new situation.
One popular Bakugou and Uraraka fanfic is 'Unexpected Bonds'. It explores their relationship in a different light, showing how they might interact outside of the main story's battles and training. They start off as rivals but gradually develop a mutual respect.
As of the latest chapters, Izuku and Uraraka have shown some mutual interest and closeness, but it's not a definite romantic pairing yet. It's still evolving in the story.