Basal body temperature

One of the many changes that take place in a woman's body during her menstrual cycleis an increase in body temperatureat the onset of ovulation. During the first the first part of a woman's cycle, the body temperature is lower. With ovulation, the body temperature rises, usually within 24 to 48 hours (to create a more fertile environment for the fertilized egg) and remains higher until the beginning of a woman's next cycle. If the temperature doesn't go up and stay up then it's unlikely that there was ovulation. The temperature increase is driven by the hormone progesterone, which increases at ovulation. This pattern is also known as 'biphasic', lower before and higher after ovulation.

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It uses material from the http://en.wikipedia.org/wiki/Basal+body+temperature Wikipedia article Basal body temperature.