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3. Ovulation Phase

Ovulation causes a slight increase in body temperature. At these times, estrogen levels in the pre-ovulatory or follicular phase of the reproductive cycle are higher than normal. This correlates with lower body temperature. This fluctuation is the biphasic temperature pattern, which looks like two irregularities when plotted on a graph. Every woman is different, so the increase in BBT might be very small or increase rapidly. Body temperature could also drop and rise over several days. The BBT method should not be relied on until the woman tracks several cycles because there is so much individual variation.

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