Birth Control Hormones vs Natural Development

Patient : I went on a monthly birth control pill in May but about three months in I experienced breast growth and tenderness but nothing too significant. Then in about September I switched to a different birth control (a 3 month cycle) (experiencing no reduction in breast growth during the transition) and by about January (4 months later) I was up a full cup size from my original size. This change didn't seem as drastic as the first one and wasn't accompanied by sudden or severe breast tenderness. However, it seems like, over a year after the start of all of this, that they are growing again, and my mother says that her breasts were about my size when she was my age without birth control, so I am wondering how much of this growth was due to the birth control and how much was my body's natural growth. My breasts do seem less full when I am on my period (off the pill for a week) but this also happened when I didn't take birth control. I turned 17 on the Oct 25th before the first May that I was on birth control and I am now 18 years old. Basically, I don't want my body's shape to be something unnatural that is only the result of the medicine that I am taking, so I want to know what is natural and what is not.
Symptoms:  Breast enlargement on birth control.
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