Preparation for pregnancy test body temperature is oral, because the body temperature detected in the oral cavity is more accurate than the body temperature of the armpit, because the armpit when the body sweating is easy to have sweat accumulation affects the body temperature. In addition, when testing the body temperature to detect the basal body temperature, the basal body temperature refers to lying down in the condition of quiet sleep 6h after the detection of the body temperature. In addition, after waking up can not talk or go to the toilet, need to put the thermometer directly in the oral cavity is more accurate to detect the body temperature, and the test is best in about 5 minutes, will be so detected by the temperature of the body daily with a pen can be found in the ovulation period when the body temperature will rise 0.3 ° C -0.5 ° C.