My first period was 9/28/04 and my cycles were always 30 days in length until March
2008. After I missed it 9 months in a row, I finally got my period again in January 2009. At first, I thought it was some kind of sympathy pregnancy for a friend of mine who got pregnant in March 2008, but then later in 2009, I started skipping periods again. The cycles also varied greatly in length from 29-45 days.