Mammary Changes.-- During pregnancy the mammary glands are in immediate sympathy with the growing reproductive organs of the pelvis; consequently a genuine physiologic enlargement commences in these organs from the beginning of gestation. Their glandular structure becomes larger, fuller, and firmer; a sensation of weight or pricking is felt by the patient; the veins become more prominent. The nipples also become enlarged, more elongated, and somewhat erect. Surrounding the nipple is the areola; this becomes darker in color.
In most women a drop of watery fiuid, the so-called colostrum, may be squeezed out from the nipple at the end of the third month of pregnancy.
The signs of pregnancy are divided into the presumptive, the probable, and the positive. The presumptive signs are: menstrual suppression, morning sickness, irritable bladder, mental and emotional phenomena. The probable signs are: mammary changes, abdominal enlargement, changes in the neck of the womb, and certain changes which are felt on bimanual examination. The positive signs are: feeling the various parts of the fetus, active movements of the fetus, and hearing the fetal heart sounds.
Functional disturbances of the bladder are quite often noticeable in the early part of the pregnancy. In the first part of the pregnancy the bladder is dragged upon, and later it is pressed upon by the enlarged uterus so that the bladder capacity is lessened and frequency of urination is the result. In the fourth month, when the uterus ascends into the abdominal cavity, these bladder symptoms subside, until the very close of the pregnancy, when by the descent of the now greatly enlarged uterus there may be even incontinence of urine.
Changes in the Abdomen.-- During the first two months of the pregnancy there is a flattening of the abdominal surface, due to the descent of the uterus into the pelvic cavity, thus slightly dragging the bladder downward and drawing the umbilicus inward. In the latter part of the fourth month there is noticeable a slight abdominal enlargement, and the umbilicus is no longer sunken. By the end of the fourth month the base of the uterus has risen two inches above the symphysis, and at the end of the thirty-eighth week it touches the lower extremity of the breast-bone; the umbilicus has been for many weeks protruding; during the last two weeks of pregnancy the uterus again descends and the woman feels more comfortable.