Carb creep is when you stop closely tracking your carb intake (for example, just keep a running tally in your head during the day) and wind up eating more carbs than you should without really being aware of it.
The only way to see if this has happened is to go back to more closely tracking your carb intake for a week or so. Honesty with yourself is really important here...count your carbs based on average meals and snacks that you have been eating for the past few weeks, not going back to induction and then counting.