Why should I convert PDF to DST ? With the conversion of the file to a different file extension you can use other programs to support it. Keep in mind, however, that PDF file, when converted to DST may differ slightly from the original, at least in terms of the data system.
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.t is not the same as period length, which is the number of days your period lasts. The day your period starts is considered Cycle Day (CD) 1 -- the start of a new menstrual cycle. Have your average cycle length automatically calculated at MyMonthlyCycles.com whenever you update your free period calendar!
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.