The increased basal body temperature is considered one of the important amongst the signs and symptoms of pregnancy. Basal body temperature can be explained as the temperature of the body which is measured just after awakening and before performing any physical activity. In women there is an increased basal body temperature during pregnancy. It is mainly caused by ovulation. During the process of ovulation, there is an one-half to one degree increase in the Fahrenheit scale or one-quarter to one-half degrees in the Celsius scale. This tendency of increased basal body temperature during pregnancy in a woman as compared to lower basal body temperatures before is known as biphasic pattern.
This particular biphasic pattern of the increased basal body temperature is charted and used as a component for creating fertility awareness. The increased levels of the hormone estrogen present in the follicular or the pre-ovulatory phase during the menstrual period lowers the basal body temperature or the BBT. In contrary to this is the progesterone whose higher levels of secretion by the corpus luteum leads to the increased basal body temperature. This however happens after ovulation.
The increased basal body temperature pregnancy signs can be experienced just the day after the ovulation. However this varies and the ovulation can be detected within a time span of three days.
If it is not the case of pregnancy, the corpus luteum is disintegrated when the next menstruation occurs. After the first three months of pregnancy, the woman's BBT drops to the normal. Pregnancy tests cannot be taken as accurate until 14 days are covered after ovulation. Also, if the woman is showing increased basal body temperature for 18 consecutive days that one can be certain, the woman is pregnant. Checking the body basal temperatures is considered more accurate and a reliable method for the estimation of the gestational period.
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