In 2019, freshman Lydia James shows up at school in her cheerleading uniform on the wrong day (OMG). Mortified, she cuts through the woods to head home and change-because what could possibly go wrong? One bad fall later, Lydia wakes up to a reality that makes even less sense. Someone else is living in her house. That someone is Kelly Stein, a whip-smart, endlessly loyal teen navigating her own complicated sophomore year-in 1989. After the initial shock wears off, Lydia has no choice but to blend into Kelly's world, and bonds with Kelly and her wonderfully nerdy circle of friends while searching for a way back to her own timeline. But when Lydia finally tumbles into the mysterious portal that brought her there, she discovers a devastating truth-one that changes how Lydia understands time, friendship, and the impossible choices that come with it. With humor, heart, and unexpected twists, OMG! Did I Just Time-Travel?! is a nostalgic, emotionally rich adventure about friendship, fate, and the unexplainable karmic magic that shapes who we become.