Review and make any changes to automatic payments or deductions you have scheduled. Adjust your automatic withdrawal or bill-pay dates to align with your new pay dates. Consider adjusting your 403(b) or 457(b) contributions temporarily during the transition period.
To calculate menstrual cycle length, you count the number of days from day one of your period (CD 1) up to, and including, the day before the next period starts. The count does not include the first day of the next menstrual period, because that's Cycle Day 1 of the next cycle. Your average cycle length displays. 2  Each time you track your next period, your cycle length is updated! 3  Use My History/Quick History, or the Menstrual Cycle Chart, to see your average, shortest and longest menstrual cycle length.
Follow the steps given below. 1  Find the last period start date. 2  Find out shortest and longest period cycles by observing your period cycles for atleast 6 months. 3  Illustrative example of calculating fertile period.  shortest cycle=27 1  days. longest cycle=28 days.  Subtract 18 days from the shortest cycle 27-18=9 days. Subtract 10 days from the longest cycle 28-10=18 days. The 9th day to 18 th day from your last period is the unsafe period. The rest is the safe period.