One of the things I love about SBD is that it's so easy to get back on track. You've been doing terrific, why let one hard week get you down? Eat your veggies, and don't waste any more time feeling guilty or annoyed with yourself.
I've never seen much point in going back to phase 1 after a couple of bad days unless I'm having cravings. I celebrated my mom's birthday with her over the weekend and had off plan treats both Sat and Sun. I'll still have my oats this morning and a few berries in my yogurt at noon time though. I'll go light on fruits and grain this week, but I don't believe that going back to phase 1 dumps weight any faster than a clean phase 2 does at this point.
Have a great, on plan day!