Should I wait or consider it a no?

Okay so I’ve gotten 2 faint positives on Walmart brand first signal (this was in the last 4 days), they do have slight color so I know they aren’t evaps. This morning i took a first response and it was negative. Maybe there was a super lighter than light line but I considered that Evap. Should I wait and test again in a week or should I consider those cheapies faulty?