HELP PLEASE! TEST UPCOMING WEEK! MAJOR TROUBLE

Ok so I'm getting drug tested by my parents this upcoming week and they said that I am getting a blood test but I think that they'll make me do both blood and urine. I would say I smoke every weekend in light amounts, not much more than a dime. I work out every day (football player) for about 2 and a half hours and weigh 200 pounds of mostly muscle. I need to know if I smoke this weekend, Saturday, what day will it be out of my blood stream? Or if im in trouble now then what should I do. PLEASE HELP!! :( NEED TO KNOW BY SATURDAY