Walmart test

So I kept a test I did Thursday or Friday and one from yesterday, looked back today at them both and one has a darker faint line than the other. Is it possible it's positive? Yes I know an old test can do this, but I usually only use first response and those always take weeks to eventually show a second faint faint line. I used an .88c Walmart one this week for the first time. So my question is, could it be positive? Or no?