I used the calculator but got 34D, but I have really small boobs

I measured as said to do online in a calculator, and it came out as 28 D, but my breasts look too small to be an A, I'm 13, how do I

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Where can I find bras that are in between sizes? 34B is too small for me, but a 34C-cup is too big. - Quora

Remember this calculator from middle school? : r/nostalgia

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bra calculator says I'm a 34D but all my bras are so loose on me - help! : r/ABraThatFits

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