I'm not sure. It depends on various factors and the source of the story. Sometimes stories are based on real events but might have fictional elements added.
The Duff isn't based on a true story. It's a creative concoction of the imagination. The story was crafted to offer viewers a fun and engaging fictional experience.
Relationship changes are often a theme. The pregnancy might cause strain or bring characters closer in the fanfiction. For example, it could test the friendship or romantic relationships of the characters involved.
Hilary Duff was approximately 16 at that time. Her performance in the movie was charming and memorable. Her age added to the youthful and romantic essence of the story.