I recently took 5ml of cherratussin 100/10. and had a drug test exactly two days later. will it show up on the test ? or is it not enough to show up?

Probably not: 5 ml of this cough medicine is a small amount, and for most people, this should clear your system within 24 hours unless you have some condition which slows your metabolism. Often in this situation, you can provide the prescription matching the medicine you said you took; the lab can extrapolate whether you took it according to directions. Obviously best to avoid if you know you're being tested.