ll probably want a few copies of the blank
chart because it will take at least a
cycle or two to figure out your ovulation pattern.
Before ovulation, your BBT probably ranges from 97.2 to about 97.7 degrees Fahrenheit. But two or three days after you ovulate, hormonal changes cause a rise of 0.4 to 1.0 degree in your BBT, which lasts at least until your next period.