Could this be a bfp?!

AF isn't due until Friday, but I couldn't wait and took an 88 cent test this morning. Nothing showed up, so I assumed negative. Looked again this evening and there is a VERY faint line showing. Could this be a positive, or do the lines just show up after so long? It is hard to tell in the picture, but looks more clear in person. Trying not to get my hopes up.