ovulation is when your body releases an egg and that can take only a few hours. The egg that is released will last only 12-36 hours after that.
If that egg is not fertilized by sperm then it deteriorates and you get your period.

so you see, ovulation would happen about that same day that the calendar predicts and you are most fertile two days before and one day after that ovulation date.

Only by recording your temperatures first thing in the morning before getting out of bed (using a Basal Thermometer) will you pin point your real ovulation dates.

Your temperature sign is the sign that will best help you to precisely pinpoint the day that ovulation occurred. This is because progesterone, and hence your temperature, increase quite dramatically just after ovulation has taken place.

Before ovulation, there is only a small amount of progesterone present in your body and your basal body temperatures (your resting temperatures) are in the lower range. After ovulation, when there is increased progesterone secreted from the corpus luteum, temperatures become elevated. The temperature elevation that occurs after ovulation is sufficient to be measured with a BBT thermometer and viewed on a BBT graph when a few simple conditions are met.

The rise in temperature is usually about 0.4 degrees Fahrenheit or 0.2 degrees Celsius, but the rise may be as slight as 0.2 degrees Fahrenheit or 0.1 degrees Celsius or even less in some cases. The actual temperatures are less important than noting a biphasic pattern showing two levels of temperatures. FertilityFriend.com will indicate that ovulation has taken place once a sustained temperature rise is observed (at least three days).

If there is no pregnancy, your temperature will stay elevated for 10-16 days, until the corpus luteum regresses. At this time, unless there is a pregnancy, progesterone levels drop dramatically and you get your period.

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