Not sure of which cups should I get HELP!! (pics)

bebeJW1

The results and consistency are WORTH IT.
I'm 16 years old & I'm a 34B. I know I'm starting off young, but I really want to be a 38DD when I get into college, and I will be purchasing the noogleberry with my allowance. Should I get the medium cups or the large cups? I'm really new to this!
 
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