cannot for the life of me figure out my bra size

i tried remeasuring for my bra size for the first time in months, and the calculator i used said 30G..
last time i measured i got 32D i think? maybe 30D. i believe it was a different calculator, not sure which.
the bra is currently wear is 34D, i got it from walmart as a ‘close enough’ bra because they had no 32Ds but now i know the band is too big because the cups fold under and make my boobs look..square? its very unflattering especially for someone who wears tight fitting shirts that emphasize it 😢
but!!! im having a very hard time finding bras online for small band sizes with cups over C that arent a bit pricey so i wanted to get some second opinions on if 30G looks right?? the band size im not too surprised by or doubtful of, but G sounds..really big to me. ive always been told my chest is on the bigger side, but idk. im not good at eyeballing cup sizes..

front and side pic

also i just wanna mention that sports bra does not fit me, i do not own a single sports or wire bra that properly fits me ;-;