you definitely haven't wrecked it. most of my group are getting real cravings now that we're near the end of the 14 weeks.
just draw a line under it, accept it and yourself and move on. Your head is now trying to tell you that you've wrecked it so you might as well go back to eating things that are bad for you but you've already done 13 weeks on this and probably lost loads of weight!
this is where you have to be really focused about why you started this in the first place and why it's so important to you. you can do it - if i can anyone can, believe me!
good luck x