Hi I have just taken a clearblue digital test. At first the display just kept flashing (for 5 mins) so I ejected and then reinserted the cartridge until I got a result, it was Negative. However when I looked at the cartridge stick inside there was a second faint blue line. Does the digital work by looking for two lines then displaying result? Could it have missed a line? Or am I barking up the wrong tree. I have one more but am loathed to do it now, will probabnly wait for morning. But anyone out there had similar or have any info?