In a normal case menstruation happens every 28 days counting from the first day of the flow. A missed period normally is an indication of pregnancy, it is not always so. According to Astrology, these disorders have a lot to do with the positioning of the Moon and Mars. Moon plays a very significant role in the life of a female as the reproductory and sex organs, marriage relationship etc are governed by the moon.
As a remedy to ill placed moon gem therapy recommends the usage of a single white pearl of minimum 10 carets along with a red coral gemstone as additional gem if required.