Since the time I started, my period
has obediently shown up every 28 days
exactly, and has lasted for four days
. Every four weeks for the last three years (nearly), without fail. Sometimes it's shown up first thing in the morning, and other times close to midnight, but always on the day that it's supposed to. Today, for the first time, I completely forgot that I was supposed to get my period. I didn't feel the usual faint cramps as a sign that it was on its way.