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Why did I miss my Period?

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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?

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replied August 4th, 2006
Early Pregnancy Signs and Symptoms Answer A1318
Missing a period is the first sign of pregnancy, but it is not 100% valid evidence of a pregnancy. That’s why doctors recommend women first take a home pregnancy test. If the test is positive, then you are pregnant and you can visit a gynecologist for ultrasound confirmation of the fetus. If the test is negative, then you are not pregnant but are experiencing menstrual irregularity. Menstrual irregularities are usually caused by hormonally active ovarian cysts. In these cases, the period usually comes late and is heavier than normal. If you don’t get your period in 2 weeks, you can go to your gynecologist for an ultrasound examination.
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