First Sign of Pregnancy

During the first few weeks of pregnancy the breasts enlarge and sometimes tingle. The skin around the areola often turns pink, and the oil glands around the nipple become somewhat larger. After the 16th week some woman find that they can squeeze colostrum, the thin milk normally secreted immediately after childbirth, from their nipples ( Presumptive Signs of Pregnancy ).

For most women the first sign of pregnancy is usually a missed menstrual period. It is not, however, a reliable sign. Moreover, about 25% of women who are pregnant occurs at the time of an expected period, as it often does it may lead the woman to think that she is having her period.Another very early sign of pregnancy is a basal body temperature "waking temperature" that is elevated by (0,5 degrees) Fahrenheit "(0.3 degrees) Celcius" for more than three weeks. This sign is most likely to be noticed by women who have had trouble conceiving and are taking their temperatures on awakening with a special basal body temperature thermometer in order to determine the days when they are most likely to be fertile.
About the eighth week changes in the pelvic region can be detected. The normally pink walls of the vagina begin taking on a bluish color, the cervix begins to softens, and the lower uterus may begin to soften. After the eighth week the uterus as a whole is usually perceptibly larger and soften, but noticeable enlargement of the abdomen does not usually occur until about the 16th week.
Other early symptoms of pregnancy may include an increased need for urination, constipation, nausea, especially between the 6th and 12th weeks, and often in the morning "morning sickness", cravings for particular foods such as pretzels or pickles, and an overwhelming sleepiness.

Some woman experience a temporary darkening of their facial skin and of the skin around the nipples and the middle of the abdomen. This results from stimulation of pigment cells by increased secretion of certain hormones. After the 12th week it is fairly common for a woman's gums to swell somewhat. 
In most women, pregnancy is marked by a steady weight gain, representing the weight of the baby, the amniotic fluid surrounding the baby, the placenta, and the normal accumulation of fluid in the mother's tissues.
A woman who is carrying her first baby can expert to experience quickening the occasion when she first feels the baby moving inside her about the 18th week. Women who have had babies previously usually experience quickening about the 16th week. Sometimes, however, a woman may experience the feelings associated with quickening even though she is not pregnant.

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