My boobs don't look like a 10D?

So I've been on birth control for seven months and they have grown two cups. A C cup is too small and they spill out so FINALLY I went out and bought some D cup bras and they actually fit perfectly but I don't seem like a D cup? I feel like they don't look big enough but the bras fit perfectly.

Does anyone else have this thought?
My boobs don't look like a 10D?
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