How long does Benzoylecgonine show on an E-cup drug test?

Okay so today is Wednesday, last friday night I did a small like of coke which was probably 0.05g, and smoked 3 cigarettes with it on the butt. It was my first time ever doing cocaine. I had a drug test today for a job, and went ahead and took it. The last time I smoked marijuana was last wednesday, but I'm not worried about that part. I always get clean from weed really quick cause I have a high metabolism. I smoked a blunt wednesday and was clean by Sunday according to the at home drug test I took. The cocaine part is what is scaring me. Ive never done it before and havent since then, but im just a little nervous. Any words of reassurance please? Please dont preach to me about not doing it, etc I just want a straight forward answer!