Okay, this started in June... normally, on the 22nd or 23rd of each month, my menstrual cycle begins. Last month, however, it started on the 15th -- a week early. Now it's August and I still haven't had a period! The last time that my fiance and I had relations was about the 14th of July.

In the past two weeks I've experienced some moderate cramping in my hips, which usually happens a week prior to my menstrual cycle. I've had no signs of early pregnancy at all, although I am fatigued because I work tweleve to thirteen hour shifts at night and get on average six to seven hours of sleep. I've also have a very bad summer cold for the past two weeks.

In the first two years of menstruating, my periods were very heavy and irregular, lasting anywhere from 3 - 8 days with extreme cramping and often times bleeding accidents. When I do menstruate, I still experience heavy bleeding and cramping, but my periods always last 8 days.

Is there anyway that I could be pregnant, or that my horomones and job could have something to do with missing my period?