Remember, things can have a "not begining" . For example:
Stewie and Brian travel back in time using Stewie's time machine. They are warped outside the space-time continuum, before the Big Bang. To return home, Stewie overloads the return pad and they are boosted back into the space-time continuum by an explosion. Stewie later studies the radiation footprints of the Big Bang and the explosion of his return pad. He discovers that they match, and he concludes that he is actually the creator of the universe. He explains his theory to Brian, who replies with "But Stewie, the universe created you. How could you have created the universe?" Stewie explains that it is a temporal causality loop, which is an example of a predestination paradox.