No. Oftentimes when prophets spoke to people, the prophets spoke of what would happen if the people did not change their ways. In this case, the people changed their ways: “The Ninevites believed God. They declared a fast, and all of them, from the greatest to the least, put on sackcloth.” (NIV, Jonah 3:5) Their repentance was sincere, so God refrained from sending ruin upon them.