Which Time Called Safe Period and Fertile Period

About to know this time period  is needed for all male and female. Another  is fertile period. When women menstrual cycle go to an average position on the 14 days destructed lutigining hormone flow ovum flowed within after 36-38 hours left. This extracted ovum , if connect with fertile spermatozoa then it will go to child creating position. The ovum alive time period is 72 hours.  After sex when spermatozoa entered into matrix its also alive 72 hours. Menstrual period 28 days average after 14 days is fertile period and previous 5 days is safe period.