I have used these and the digital for months. So I understand how they work. However my control line is usually a lot darker than this. I know it is positive if they are the same so does that make this positive since they both are equally faded? Or invalid? Also it is my last one which is why I haven't tested prior trying to wait till after the holidays to get more :) also I use different apps and they are usually pretty close however this month's is very off from the other apps so I'm wondering if I already missed it!