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The luteal phase is calculated from the day you O to the day you actually start your AF. So, you would have to count 14 days back from the beginning of your AF to see when you O. That phase of your cycle is called the Luteal Phase. If you don't chart, you might start. I used Fertility Friend online and once you have enough (a few cycles) entered...it will calculate all of that for you.
A "typical" luteal phase is 14 days...however, that is not always the case. Even with a "typical" 28-day cycle, it is possible that you ovulate earlier or later. If you ovulate later, it can potentially make it harder to concieve if there is not enough time for the egg to fertilize and implant before the onset of the next cycle.
You can try tracking CM, BBT and use OPKs to help pinpoint your ovulation. You will need (except perhpas for the OPKs) to track a few cycles to determine if you have a "regular" pattern to your cycle. In addition, there are blood tests your ob can perform to determine if your hormones are rising/falling at the "correct" times in your cycle -- although I would try the other methods first.
Is there a specific reason/concern that you are asking?
Good luck!