Hi all I know my car is due a cambelt change next year I can't afford it this year but next year it's getting done I got 74000 miles and it's a 06 car so next year at 84000 it will get changed

Question I got is what are the symptoms of the belt being one tooth out if any symptoms at all

Reason I ask is if I rev my car hard especially when under load I can hear what sounds like a tappet sound not loud but noticeable as if the engine is straining it is def due a oil change and j am doing that next week and also fuel filter next month

Any ideas or not guys cheers again