The length of follicular phase is not certain, but the luteal phase is fixed for about 14 days. The next day after ovulation, because the ovary forms corpus luteum, the secretion of lutein will make the temperature rise 0 ℃. About 6 degrees, the body temperature changes in both high and low. The high temperature period lasts about 12-16 days (average 14 days).<br>
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