This is not uncommon: Almost all women have an irregular period once in a while. This can occur for many different reasons. Unless this pattern continues you should not be concerned. I am not sure how you determine when your period is due. In general, woman's menstrual cycles are 28 days, from the first day of bleeding to the first day of the next period. In which case, your period should have started on Nov 5.
Answered 11/2/2014
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