too light or positive?

Kayla

So I've experienced bad blue dye test in the past that had bad dye runs and looked pisitive and I'm nervous. This was very much so there after 30seconds but worried its one of those test because its light. Is it likley just a dud or should i retest with pink dye ? Ive had several blue tyes trick me in the past but my local store only carrys these I'll deffinitly make the drive to a bigger store if its liklsy this is actually a positive.