Yo i've been checking and double checking your photos ! good news man ! it's not fungus ! it's good news because at this stage of the flower the cure can be almost as bad as the ilness ! gotta keep those buds dry ! it s a bit of P/K deficiency from making buds... you can tell from the rust spots commen on. just add some boost or flower nutes and pray for yield, but you got a good one here, no stress!