If two of the tests have two lines, it doesn't matter how light they are.. It means your preg. The digitals take a little bit more hcg to give a positive result. The spotting could be a result of implantation.. I would make an appt with your doctor. Just make sure that you read the tests with the lines in the proper amount of time, and not after the time suggested, otherwise it could be just be an evaporation line.