Positive?

I took a pregnancy test this morning and I thought it was a negative. I didnt see any line. I also waited 10 minutes before I put it away. I looked at it again tonight and I noticed that it has a faint line. This test is more than 12 hours old. I plan on testing again tomorrow morning with a first response. But my question is can I kinda consider this a positive even though the test is so old? Thank you for your input. I really appreciate any response! :)