Or you may have another dilemma. You started writing your story and were able to wrap up the narrative in only two pages. You went from having a short story idea to having a REALLY short story.
Technically, either of these remains correct when called a short story. There are many different types of short stories and they can range from something extremely brief to a longer and more fully developed narrative that unfolds over many pages and may even be broken into mini-chapters. That is the beauty of the short story format. There is no correct way to write it!