subject: How to Calculate Your Luteal Phase Length [print this page] The 3rd and final step is to identify the days that you are most likely to conceive. This is important because each month there is only a small window where it is possible for you to become pregnant. Using the example above of a 28 day cycle and a luteal phase length of 14 days, your most likely day to conceive would be around the 14th day of your cycle.
