Am I going to pass my drug test?

I smoked about a gram of good weed 30 days ago. Since then I have worked out 4 times a week, while drinking about 100 ounces of water each day. I am 6 feet tall and weigh 200 pounds. Also, a week ago I bought a home drug test from Walgreen's and two dark lines showed up, so I was negative. Will I pass the lab drug test also?