Should I be worried if I haven't had my regular mentrual cycle since august of 2013?

Do Preg Test, soon. If not preg, don't worry, just get to doctor, dep on many factors, they'll be able to test other causes, and offer treatments, if any are needed. What are you waiting for? How long have you had periods for? Is this the first time late? What do you mean by regular? What other kinds have you had?