Evap or VFL (15DPO)

Larissa
I am 2 days passed missed period or alternatively 15dpo. I took a First Response, 6 days sooner, on Wednesday (12dpo) and got a BFN. Because AF has not shown I sent husband to get tests, hence the blue dye. Is this a line? Would it be so light 15dpo? Waiting to test tomorrow with First response but impatient.... 

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