4 cookies, chocolate, SUNDAY SNACK?

Ok, ive been eating healthy trying to lose weight. i started putting a jat together with candy, 100 calorie snacks, and those oatmeal cookies from walmart. I dont know if this will be bad but can i have 4 oatmeal cookies every sunday and not gain weight? or something? 2 pieces of chocolate? (fun size hershey bar, reeses er cup, that coconut nut candy, 100 calrie snack). OR 2 cookies and a piece of chocolate? OR 100 calorie snack pack w/ 2 cookies? PLZZZ HELP Sunday is tm! Im dying for some sweets!