[confused]

Having something start after several weeks isn't strange. It just isn't guaranteed. As far as whether you should be concerned about what the lump is, it wouldn't be unusual for it to be a breast bud. People on a forum cannot tell you for sure if you're okay. Only your doctor can do that. But what you are describing doesn't sound unusual. You may even find that what you have developed is permanent female breast tissues. Congratulations, I think? You seem very unsure about what you want. I hope you are able to sort out your desires before you do anything you regret to your body. Continuing with the professional sounds like a better plan than taking more PM at this point. You can always resume the PM in the future if you decide it is what you want.

Right, these are exactly my thoughts. A month ago I would have been
very lucky to notice any change, let alone a bud. Right now, even as I write
this, I can't really make up my mind... (these "cycles" and mood changes
are not too frequent but also not too rare for me not to notice them)

I admit I was very scared and that's why I threw out all the PM and the
bra. I figured I had the time for PM to set in while I decide where I
really want to go. So PM gave a big surprise. Relative to experiences of
others on this forum, I seem to react to PM very quickly and the effects
seem to last longer. Oh well...