branquinha-I'm really glad to hear that your attitude about the process is so positive!
I think we all go through something like what you are feeling right now. If you look at how slim people eat, you will see that they can have a "treat" and then go back to healthy eating immediately afterwards! I remind myself of that whenever I eat something that isn't "on plan." This way of eating certainly isn't an "all or nothing" proposition, and I love that!
So, if you feel like starting fresh with phase 1 tomorrow, that is fine. But remember that you didn't "blow it," and you can choose to move ahead!
Good luck and let us know how you are doing!