And I really don't want to hear the ''this is not what mainstream says'' rubbish. I have read plenty texts on this subject and I can assure you, this is what maintream says.
Hawking has said this, Penrose has said this... leading Cosmologists have said this. This is in fact what is still being taught in universities. The reason why is because in the very initial state of the universe, there was no size we can speak about. Also, quantum mechanics can go to this state easily, but relativity would permit a singularity in this region. Some have considered this a break down on the theory.
And I am not talking about after the Planck Epoch, I would hope that part is clear enough.