OPK question...

I know it's happened to me before without a problem, but my OPK's don't seem to finish darkening until after the 5 minutes has passed. Not just the test line, but the control line too? They're still ok, right? It's been about 10 minutes and they seem pretty much done. I might look at it 5 minutes from now and they get a little bit darker? Is this normal? I'm pretty sure most of my OPK's have done this, but wasn't sure if it happens to anyone else. And yes, I know, I should use the SMILEY digital one's! I just can't afford to spend that much on digitals when the line one's for the most part works pretty well.

Re: OPK question...

The same things happen with mine. I think they darken up when they dry. I still think that mine is a + even if both are light as long as the test line is the same or darker.