Is my period ever going to come

Meredith
I pms'ed for over a week, had all the symptoms I usually have. I was pissy, cramping, face broke out, everything. My period is almost a week late now and I'm not cramping anymore or anything. I know I'm not pregnant because I haven't had sex. (Unless I'm the next Mary!) Is it possible to have a month when you just don't have your period?