[Coffee.]

Are you sure? I looked up a bit more. As sometimes being late, sometimes your period will be lighter when you are under stress or have certain medical conditions (particular STIs, but not always so extreme), so keep that in mind as well. And Eating Disorders can lighten/get rid of your period, but so can a change to a healthier lifestyle (such as a healthy balanced diet from a diet higher in salt) so there are a few things that can cause it.