I also have natural gynecomastia, I'm a small b cup, mine grew when I was 13,I weighed at that time 115-120lbs.this is the other reason I'm not doing hrt,for I got mine the natural way,I look female when I shave the stache, and am female with just a little extras. I do know you will probably end up with dd or you might not grow at all, I know if I took hrt my body would take to it like a duck to water.