is it your first dose? and how much do you take?
if it's your first dose it probably wouldn't hurt to skip it
if its a regular dose um again depends on the amount if its a low dose say under 10mg then it probably wouldn't hurt to take it but if it's higher it could lower your immune system more so the cold might get worse
i recently had pneumonia and when i took my usual dose next day i felt lousy so when it was due again (i take it twice weekly) i skiped my dose. But if worried do you have a 24hr clinic or a friendly pharmacy you can check with? sometimes you can ring a local hospital and ask?