ClearBlue (not digital) PG Tests Defective?

I swear I'm pregnant but both my Clear Blue tests have been a BFN 😣 at 12 DPO and having pms symptoms since two days ago and still no sign of AF (BUT according to both of my fertility apps, I was supossed to have AF a day or two ago)....I watched a tcc YouTube video last night, the girl said to NOT use the kind I was using. Because of the blue dye...? Has anyone heard of this? Could they be giving false negatives? Idk if that's even possible. Could that be a reason the tests I got were on sale or cheaper than the rest? (Walmart). Or am I just testing too early? Or maybe AF is just taking her sweet time..... Sigh*.... So confused.