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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.
Low temperatures are observed before ovulation and higher temperatures are recorded after ovulation. Your BBT, or basal body temperature, is your body temperature at rest as measured in the morning after at least three hours of sleep, before you get up, with a special BBT thermometer that you can buy at your drugstore. Before ovulation, during your follicular phase, basal temperatures are relatively low.