Nope, nothing wrong about that. It's very, very, very, very, VERY common and NORMAL to have irregular periods. Many, many, many women have irregular periods. There can be no reason why. I don't recall ever having a "regular" period myself, although I did have extreme abnormal pain, which is why I started birth control. If you are really worried, you can start birth control as that will regulate or (in my case) stop menstrual cycles.