queen, if you feel you can do P1 another week then go for it. I would say however that P1 is so restrictive you might feel like giving up, you know, if you tried to take it too far. Just my .02
Also, one or two sweet treats (even excessive amounts) just once isn't going to throw you too badly. You didn't gain all your weight in one week and your not going to lose it all in one week either. I repeat, you didn't gain it all in one week. It was a gradual gain from eating poorly for months and months. Once in a three week period is not frequent enough to make you gain weight. IMHO.
I also over did it with chips. They are gone thank goodness and won't be bought again until Labor Day.