How can you tell if you have a cold, if it doesn't come with a fever?

Okay, if a cold does not come with a fever, how the heck am I supposed to tell if I am sick, or if it is just my body acting up? I honestly find it BS that only with the flu can you have a fever.
Update: I do not want to stay home unless I know I am sick as in 100% sure.

People usually rely on the fever to tell them that.
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