Did you test yourself with the first void of the day? Your first void will contain the highest concentration of thc metabolites. If you are getting a line with your first void you should be in good shape. Remember the intensity of the line is not a factor. Since you have a couple of days, practice the dilution method and test yourself to see how you are doing. The day of your test substitute gatorade for water but otherwise follow the sticky instructions to the letter. I think some people have issues because they get nervous and over dilute. As of right now you should be in fat storing mode. Eat fatty foods, no exercise, be lazy. Take your creatine monohydrate. Oh and the niacin will not help you at all, forget about it.