Im 13 years old almost 14, and im worried. GIRLS ONLY.?

hey! im turning 14 in september (commin soon) and i just feel really weird, i wear a 34A. my mom wears B cups, yea i get im young and all, but i dont wanna grow up with super small boobs. are you sure they'll grow?! but ive already started that whole puberty thing, im already on my period, CAN THEY STILL GROW?! :(
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