Confused between blue and pink dye

So I took a test at 12dpo with a blue dye and got this very faint blue line in the first 3 minutes (see photo). I got a little excited but decided to take everyone’s advice and try the pink dye the next day to confirm. 13dpo, took the pink dye and there was absolutely NOTHING! Does this mean it was a complete false positive? What have been your experiences with the both of them?