1. Put the start date of your period on the calendar.

2. Put the start date of your period on the calendar.

3. Count back 14 days to find the approximate date of your ovulation.

You can now begin to get a feel of the length of the first phase of your cycle which leads up to ovulation.

4. This is the phase than can be vary between women. In this example the length of the first phase is 16 days.

5. To get a real picture of your cycle, it is a good idea to track in this way for several more periods.