Nuvaring and Breast Growth

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I was just curious and reaching out to the ladies on the ring, have you noticed a change in your boobs since starting it? I've been on the ring consistently since February (so about 5 months) and I noticed within the last 2 months I've gone up a cup size. 
I haven't been doing anything out of the ordinary, like eating more unhealthily, and until now I've had B cups since I was 14 (now 19). I'm certainly not complaining, I just thought it was a myth that boob size changes on birth control!