Hi, I have a drug test coming up on friday. I smoked last on March 2nd. I am highly active and eat healthy. I took a quick screen test yesterday afternoon after drinking 4 bottles of water. The line was extremely faint pink. Because of that I have now bought niacin 500mg and cranberry juice which I will be starting today. I am only taking the niacin once or maybe twice a day for the next couple of days. My question is, will it be possible the faint pink line could darken by friday?