Well, without more context, it's difficult to say precisely. It could potentially be a fanfiction centered around a Kara who has some sort of extraordinary power related to 'zor el' and the concept of time is used to create an interesting plot. Maybe it involves Kara going back in time to fix something related to 'zor el' or using 'zor el' - based powers in different time - frames.
Since we don't really know the details of this fanfiction, it's hard to say for sure. But we can assume Kara is one of the main characters given that she is in the title. There might be other characters related to the 'zor el' aspect, perhaps friends, family or foes from the 'zor el' place or group.
One popular Kara and Mon - El pregnant fanfiction might be 'A New Beginning'. It focuses on how they navigate their relationship while expecting a child. It shows Kara's struggle between her superhero duties and impending motherhood in a really interesting way.
You can try Archive of Our Own (AO3). It has a vast collection of fanfictions, and there are likely to be many about Kara and Mon - El being pregnant. Just use the search function and type in the relevant keywords.
The settings are another unique aspect. Fanfictions might blend the magical settings of Hogwarts and the wizarding world with the modern or other - worldly settings associated with Kara Zor - El. We could see Kara flying over the Forbidden Forest or Harry using a portkey to visit Kara's adopted home on Earth. This creates a whole new world of possibilities for the story, different from either the original Harry Potter or Supergirl storylines.
One great 'Harry Potter and Kara Zor - El fanfiction' could be 'The Meeting of Magic and Kryptonian'. It imagines Harry and Kara meeting in a world where magic and Kryptonian powers co - exist. They team up to fight a common enemy that threatens both the wizarding world and Earth.
I don't have enough information to fully define who Kara Robinson is just from this 'watch the Kara Robinson story' statement. She could be an ordinary person who has had an extraordinary experience, or perhaps someone who has made an impact in a particular field or community.