Blue dye vs pink dye—different results

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​What’s a girl to think?!?! Same thing happened two mornings in a row, digital was also negative 😩 is the blue dye a false positive? I’m 15dpo, AF due sometime yesterday or today