<div class="row-fluid">  <div class="span6">    <p>Menstrual cycle is counted from the first day of period to the first day of the next period. For most women the menstrual cycle is between 21 to 35 days.</p>  </div>  <div class="span6">	  <img width="380" height="317" alt="Illustration of phases of menstrual cycle showing that the first day of the cycle starts from the first day of menstruation - Menstrupedia" src="/assets/quickguide/physiology/pysiology-menstrual-cycle.jpg"/>  </div></div><div class="source">  <h5>References:</h5>  <ol>  <li>Menstrual cycle: What's normal, what's not, <a rel="nofollow" class="reference" href="http://www.mayoclinic.com/health/menstrual-cycle/MY01541" target="_blank">http://www.mayoclinic.com</a></li>  </ol></div>

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