[happyboobs]

Put very simply, Progesterone acts to develop branching on the ends of ducts formed by estrogens, and in doing so it adds roundness and fullness to the basic triangular shape 'estrogen only' breast development.
It follows that Prog can only work once E has done its stuff i.e you cant develop branches on ducts that don't yet exist. So taking it too early in your breast growth is pointless and in fact may somewhat inhibit further E type growth once terminal branching starts.

For myself, it did nothing when I first tried it in my early days but I did see some rounding and cleavage infilling more recently. Unfortunately my ability to get hold of it is limited so it's a bit hit and miss for me.
I can't say that either PM or Prog has done anything else to my body other than breast development and, to some extent, body hair control.

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Great thread and post. Also Adding P at the end of the day can help relax and better sleep, and is a good blocker of T and mentioned in the no morning wood comment " alt="" title="">