If you did coke on Friday and did a drug test on wendesday would it show up?

No. Is the short and simple answer, coke usually takes about two to three days to cleanse it's self from your system. Of course other factors play a role in the length of time it takes to detox. Examples are: The amount of the drug you used, the quality of the drug, and the metabolism of your body, amongst others. However, generally speaking and in most instances, five days should be plenty of time to allow your body to detox, and return a negative result on your typical company drug test.