First, everyone is different, but for me I have been late since I started LCing. First month, I went 34 days, second 32 days, 3rd, 30 days and so far on this one I am at 31 days and still no sign. No, I am not pregnant. I honestly think that our bodies are reacting to the change in our eating habits and exercise habits, either more exercise or just exercise in general. I wouldn't stress it too much, but to be on the safe side, go see your gyn.