STAY AWAY FROM PIZZA!!! that's my worst food for weight gain. i haven't had pizza hut since march...i do think (or should that be fantasise?) about it quite alot though! lol
you'll probably be fine as it's you're 1st week, but i wouldn't test it out again. i did it once last year and maintained, so i did it again the following week and had a 2lb gain!
just be good for the rest of the week and if you fancy eating out go italian/indian/chinese.