ATE WAY TO MUCH FREAKING OUT!?

okay so im 5'3 weigh about 106 pounds im 17 female im on a diet pill called oxyelite pro and it works amazing i go to the gym 2-3 times a week and i feel good but today i was busy at my house getting ready for my moms bday and baking and stuff i was on my feet for a couple hours so thats the most exercise i got today but ive been eating horrible i ate 3 hershey bars and 2 bags of peanut er mnms will i gain weight from this or will my diet pill not have me gain that weight HELP.