All of my false positives on blue dyes came up within 1-3m, did not disappear over time, and did not wash away with water. I had multiple betas done that came back at 0, so the two cycles it happened weren't even cps. Pictures attached for reference, sorry for the quality I have to screenshot them. I don't want to be a Debbie downer, but I also want to be honest with you about my experience with lines like that. I do hope you get your bfp.