You should eat at least 1200 calories a day or your body will think that you are starving it and it will hold on to any fat / calories that it gets. You should just continue with your eating plan and try to stay on track. I think it is safe to say, everyone over does it every once in a while and it is okay...as long as you get right back on track. If you are really concerned about it stay on the lower end of your calorie range today (around 1200) - but you should never go lower than that. Good Luck!