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When charting your temperature, you will notice a rise of about .4 a degree the day after ovulation. This occurs, normally, in the middle of your cycle. The temperatures should stay high once you see this rise.
If you don't see a .4 rise, but notice a steady slow rise, you can assume that ovulation occurred the day before the first highest temperature. It's important to chart cervical fluid and cervical position in conjunction with basal temperatures to accurately pinpoint ovulation.