Will what i did effect me? uhgg=[?

i'm 115 pounds and 5'2....I know you have to eat healthy along with exercise to see results... but how PERFECT does your diet have to me? I eat healthy.. barley any processed foods...NEVER fast food... i do plyometrics and running... so i'm exercising about 4-5 times a week. I'm not fat or anything but i justi started eating healthier cuz i want to loose a couple pounds to look more toned. But they say exericse wont work unless your diet is perfect? I eat healthy like eggs or oatmeal for breakfast then snacks like yogurt and fruit and for lunch and dinner i try to eat veggies and get protein in.. but every now and then i treat myself or maybe might eat a cookie or somthing. will this effect my results?? i'm only 5'2 and 115 pounds.. haha i know i'm not fat but i wanted to tone up just a tad bit. and i'm scared now because i've been going to the gym 5 times this week... (i do running intervals, cardio, and plyometrics) and my diet has been pretty good.. but yesterday i had a bag of cookies and tootsie rolls =/ i did eat good throughout the day tho...? i went to the gym wed thurs fri sat... and now today i should go cuz i had that bag of cookies and tootsie rolls but i'm sooo sore from yesterdays workout