left boob now much bigger than right boob?

i get weight on my upperbody so usually when i gain a few kgs my boobs fluctuate in weight usually getting a bit bigger etc. the left boob has always been SLIGHTLY bigger than the left, and when they fluctuate they both fluctuate equally like so they stay the same size apart slightly bigger the left all the time. recently i gained a bit of weight and now the left one is significantly bigger than the right one. even when i lost the few kgs the left one is now quite a lot bigger. this has never happened before. is it something to worry about. why is it like this now?
left boob now much bigger than right boob?
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