"Before ovulation, your BBT probably ranges from 97.2 to about 97.7 degrees Fahrenheit. But the day after you ovulate, hormonal changes cause a rise of 0.4 to 1.0 degree in your BBT. (You may notice your temperature spiking on other days here and there, but unless it stays up, you probably haven't ovulated yet.) If you become pregnant, your temperature will stay elevated throughout your pregnancy." http://www.babycenter.com/chart-basal-body-temperature-and-cervical-mucus