I began to notice the tenderness around one month on "low-dose." I think it's normal, but personally, I haven't noticed anything "hard" in that area (only the tenderness). I've been keeping measurements and I have had noticeable growth, but nothing that would be immediately obvious to the public (while wearing a shirt) considering my anonymity.
Wearing a bra is much more comforting to me compared to none, but I am still not out to my family and friends about it. If I were in a position of being more open, then I would definitely relieve myself and ease the pain from tenderness by wearing one.
Congratulations!