Faint line on blue dye yesterday , no line today.

Ok so I know blue dye is supposedly the worst, but that’s all they had at ingles. All the other tests were bought out. Yesterday I got a faint line on the ingles brand , today I got no line on a different ingles brand. Both blue dye. The negative was on one that would have a cross if positive. The faint line was on the kind that only gives one line for a positive. My period is due in 6 days according to the app and the app is usually correct. I’m not having any pms. I usually get really nauseous as a pms symptom. No nausea. No cramping. I think I’m going to retest tomorrow with a pink dye. I guess I’ll have to go to a different store. I don’t want to get too excited off the blue dye. And I saw the faint line immediately, so it wasn’t evap. But I know if it’s early pregnancy and the hormones are low, it could be normal to get a bfn after bfp right?