Why chances of pregnancy are reduced upto 80% only during rhythm period why not upto 100%?

Dear student, 
Please find below the solution to the asked query        

Rhythm period is not 100% efficient in controlling pregnancy because it requires menstrual cycle of woman to be regular which is mostly not possible. Menstrual cycle can be disturbed by stress, changing food habits etc. So, it becomes nearly impossible to chart an accurate menstrual cycle as every women suffer from disturbances in the monthly ovarian cycle.

Hope this information will clear your doubts about the topic.   
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