I'm hoping someone can clear this up for me; I know that you're not supposed to look at tests past the set recommended time and I normally don't. However, I was going to clean out some of the old ones and I found this one (bottom in the pic) which I had taken on the day of my expected period this month. I'm 6 days late and still no sign of AF, which is why I found the bottom test strange.
When I first took it I thought that there was a second line but couldn't tell so I chucked it in a drawer. I've been using the cheapie ones that show hints of the second line as well. The top test is one from several months ago and as you can see, there is no distinct line (maybe a hint of an evap if that.)
What is the difference? Why is the bottom one showing the second line 6 days after taking and the top one, not at all? Is that a positive sign? I have more frer coming in today as I've never been this late in my life, but I just thought I'd ask out of curiosity!