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Your fertility is highest during the two days before ovulation and the day it occurs, but your basal body temperature changes 12 to 24 hours after ovulation.Since the egg only lives one day, by the time BBT indicates ovulation thereâs little fertile time left to conceive.ecause the spike in body temperature at ovulation is so small, you need a special basal thermometer (available at drugstores for about $10 to $15) to measure it. A basal thermometer records temperatures in one-tenth of a degree increments instead of the two-tenth increments on fever thermometers.
They are the most accurate method of predicting ovulation that you can use at home (Eichner and Timpe 2004) . A cheaper way to get in tune with your ovulation cycle is to chart your basal body temperature (BBT) and monitor your cervical mucus.Basal body temperature (BBT) is your temperature when you first wake up in the morning, or after at least three hours of uninterrupted sleep.To record your BBT, you need to use a basal thermometer. This has a finer scale than a normal thermometer and lets you record tiny changes in your body temperature.o use a basal thermometer, you need to take your temperature before you get out of bed. Try to take your temperature at the same time each morning, and before you have anything to eat or drink (FPA 2010) .