My period is three days early and I'm having light bleeding and light cramping?

Not uncommon. I would not be alarmed if your period is 3 days early. It sounds like you're starting your period early, which is quite common for women. There are many things that can affect the timing of your period - stress, wt loss, exercise, pheromones.. if it becomes too irregular, they discuss it with your gynecologist.
OK. SEE WHAT HAPENS. WHAT IS THE QUESTION? NOT ALL PERIODS ARE THE SAME.