Positive/Negative I have no idea

Okay my period is due on the 6th according to glow. I took the top test Saturday and the Bottom test Monday. On Tuesday I took a dollar store test and got a BFN 🙄😰 I’m not sure what the heck is going on. Does dollar store tests take a lil longer to pick up the Hcg or have a fallen victim to the Deadly blue dyes 😩