Two lines or one?

Okay so I'm young and like most had a very slight smoking problem and I stopped about a month in a half ago (I'm talking Mary Jane) and I'm really trying to get my life together and get this REALLY good job so when I do get pregnant I can take care of him/her and I have to pass a drug test so I went and got a "at home" drug test just to see if I would pass or if I need to wait longer and I always see people on here with faint lines on pregnancy test and people can spot the second line from a mile away...well I need to know if I'm just seeing a faint second line because I want too or because it's there? (The instructions said even if it's a very faint line it's still a negative so I'm praying I passed) can someone help me out here please?