You could be retaining a bit of water. You could also be adding some muscle since I can imagine you are working muscles that aren't used to being worked (P90X). Most of your initial weight loss while doing a keto diet is water; I wouldn't try to compare your results with this plan to that of a keto diet. Use your mirror over your scale.
Keep giving it your all with your workouts.
I wouldn't make any huge changes with it being only 9 days.