I took Plan B and my period came a week later and was light and has now lasted 8 days. Is this normal and how do I get rid of the unpleasant odor?

Vaginal odor. period sounds ok but vaginal odor is not usually so please get examined for possible infection.
A Clothespin. 1)Don't expect a normal period after taking a powerful hormone. Don't expect that to last very long either. So if things are getting out of hand, like one or two cycles, then see your GYN. 2)You get rid of the unpleasant odor by getting rid of the cause; another reason to see your GYN. Old blood can smell off, but if it's really unpleasant to you, it could be something else that needs tending to.