I took a pregnancy test yesterday and mine did this also. Until about 8 min. after that test. The test packet said not to wait that long, to determine whether or not you were pregnant after 5 minutes. What kind of test did you take? Maybe you should take a different brand... one of those that doesn't have the lines, but something else. Maybe that'll work. I don't know what it is... I'm just as confused as you. I'm 5 days late for my period though. I hope we figure it out!
If you get any info about it, let me know. We can help eachother find out what it was.