"Don't count your chickens until they're hatched" means that you can hope certain things happen in the future, but you cannot know for sure that they will happen until they actually do happen. Example: "Do you think that Bill is going to offer you a promotion this month?" Reply: "I won't count my chickens until they have hatched." "Chickens" start out as eggs, and you can count the eggs, but not all of the eggs will hatch to become chickens. "Don't count your chickens until they've hatched" means don't make plans based on something happening until that thing has already happened. Example: "Next Friday I will finally be able to pay you back that money I owe you." Reply: "Ha. I won't count my chickens until they have hatched." "Don't count your chickens until they've hatched" means that you should not count on something happening until you are sure that it will happen.