When I was going to WW meetings, our leader always stressed how important it is NOT to eat under your minimum daily points. (This was back when the points were done in ranges, I know it's different now.) The best thing to do is just get right back on the horse and keep going.
From my experience, trying to eat too little has done nothing but screw me up. My body's all "oh man, not enough food, store fat, STORE FAT!" when I don't get enough calories, and I either maintain or gain. I rarely lose anything in that scenario.
So take a deep breath, realize that binges (I prefer to call them "poor choice days") happen every now and again, and don't beat yourself up. You may even wind up seeing a loss this week.
Good luck!