Can't diet on aunt flow

Today is my 7th day on the Nutrisystem diet, and all was going great, I lost 3 pounds so far. Aunt flow is supposed to come in 4 days, well I was having an insane craving last night so I had 2 teaspoons of ice cream at midnight. Now I know why I was having those cravings. Aunt flow showed up this morning. 4 days early! I'm never early. Anyway I stuck to the plan for breakfast but messed up again for lunch. Had 3 granola bars instead of 1. I can't even say that I was starving, just had that feeling for food. Is it ok to fall off of the diet for aunt flow? Or just ignore those cravings? Any tips to stay on track?