A "Loose" Woman?

When does being loose become a slight jiggle?
Years ago I saw a show about two young transgendered women. One of the trans women said she knew she was really on a female path when she went down a flight of steps and felt her breasts actually jiggle.
At this point I am not near to the "jiggle" point but I am at the loose point.
What I mean is I can feel a certain "overhang" I have never felt before in the breast area-what I perceive as the very beginning of a jiggle.
I am to the point where I can "cup" my breasts in my hands and feel a size increase. In addition I'm seeing a definite increase in the size of my "Areola" around increasingly sensitive nipples.
If the size and shape of my developing breasts are determined by my Mom's genetics, can I blame her for making me a "loose" woman?