This means you did very well! You didn't skip (many) workouts and trained consistently. At the beginning of the plan, based on your activity level, we composed a training plan with a reachable but challenging goal. You have reached this goal sooner than we expected. It means you performed above your level but you may also have selected a level that is too low for you. The workouts will continue to build up to the end of the training schedule.
Because you performed so well, we recommend that you select a higher level before starting the next training plan. We will then put our expectations from you a little higher and the training plan will become more challenging to you.