I need advice!!

I’ve taken multiple blue dye tests, my period is 6 days late, and I’m 16 dpo! 90% of my blue dye tests say positive (with evening pee) and when I tested with pink dye it said negative. I plan on going to the dr tomorrow morning but does anyone have any ideas why is shows up on blue ones but not pink?!🤔🤔 thank you for all the advice/help in advance!