HMM, id say if the second line was definately there before the time frame, then its a positive for definate. You could always test again tomorrow, see what happens?? Or you could go to the DRs and get a blood test too..
I dont really know what else to say, i hope your still pregnant!!

I just read your other thread, and im thinking, maybe (if your still pregnant) you were carrying twins, and you MC'd one of them and kept the other, hence the possibility of still being pregnant?? Definatly keep us updated though!