Does consuming extra estrogen(birth control pill) or gains weight or wearing the right size of bra can help enlarge breast size?

Or at least make it grow a little more after 18? How many estrogen pill should be consumed in a certain time?I've ever read an article about an experiment for women who diagnose have a high risk of breast cancer,consuming birth control pill in a certain time and the result turn out could reduce the risk. But this experiment havent proven yet. Some says those pills may cause the breast cancer.Which one is true? If my breast got bigger by gaining weigt,will it become smaller if I lose some weight?

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