Asking an employer to reschedule pre-employment exam?

I am schedule to have an pre-employment physical and drug test tomorrow, but I'm coming down with a cold and I afraid that it might get worse tomorrow since I can't take any medication as I'm afraid that this may lead to any false positive on my result. I really want this job so I don't really want... show more I am schedule to have an pre-employment physical and drug test tomorrow, but I'm coming down with a cold and I afraid that it might get worse tomorrow since I can't take any medication as I'm afraid that this may lead to any false positive on my result. I really want this job so I don't really want to leave a bad impression with the employer. If my symptom get worse and I have to reschedule it, would that reflect negatively on me? I don't want my employer thinking that I am faking for any reason.
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