Basal body temperature increases slightly from conception until the end of the first trimester, which can be used to determine fertility and early pregnancy. A stable elevated temperature for more than 15 days after ovulation is a strong indicator of pregnancy. Temperature returns to normal at the end of the first trimester.
A pregnant woman’s basal body temperature will remain slightly elevated from the time of conception until the end of the first trimester. In most cases, this small increase in resting temperature isn’t noticed except with the use of a basal thermometer, which can accurately read body temperature to within 0.1°F (0.18°C). Many women use the slight fluctuations in basal body temperature to determine when they are most fertile and thus as an early indicator of pregnancy.
Although there are normal fluctuations in basal body temperature, during pregnancy it is generally between 0.4 and 1.0°F (0.072 and 0.18°C) higher than between a woman’s period and the time of her ovulation. If a woman’s basal body temperature remains elevated for more than about 15 days after ovulation, this could be an early indication that she is pregnant. False negatives are not uncommon with pregnancy tests, but a stable and slightly increased temperature since the time of the most recent ovulation for two or more weeks is a strong indicator that the woman has conceived. During this time, pregnancy tests are often unreliable, so many women use this temperature to determine whether or not they might be pregnant.
Your basal body temperature will remain at this slightly elevated level for the first trimester of a normal pregnancy. At the end of the first trimester, the woman’s temperature returns to normal. A large increase is likely an indication that you are battling an infection or disease.
Many women use basal body temperature to help them determine their fertility cycles. Temperature is usually fairly consistent between the end of a woman’s period and her subsequent ovulation. When a woman ovulates, her basal body temperature will drop by a few tenths of a degree and then rise sharply, between 0.4 and 1°F (0.072 and 0.18°C). The temperature will remain elevated until the woman begins her period, at which point the cycle begins again. If a woman has conceived, her body temperature should remain elevated, so a decrease in this temperature is a strong indicator that she has not conceived during a given ovulation cycle.
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