There are many reasons for not showing pregnancy, usually it is just late, and they are related to many factors such as gestational weeks, women’s own abdominal wall conditions and the number of pregnancies. As long as there is no sudden disappearance of early pregnancy reaction, vaginal bleeding and fluid flow, abdominal pain, etc., there is no need to worry, and they are mostly related to physiological reasons. Of course, pathological causes cannot be completely ruled out, so you can go to the hospital for obstetric examination and observe the development of the fetus. The common reasons are as follows: 1, physiological reasons 1, small pregnancy month, the uterus is not obvious, before the third month of pregnancy, the uterus is not out of the pelvic cavity, so the abdomen can not see obvious bulge, if the belly bulge at this time, should be pregnant women themselves abdominal fat accumulation; 2, tall people show pregnant may be later than others, because tall women pelvic cavity is wide and deep, so the bottom of the uterus out of the pelvic time is later; 3 If a woman’s abdominal wall is thicker, it is difficult to see the fetal enlargement in appearance, so it is later to show pregnancy; 4, under other conditions similar to the premise that primigravida is later to show pregnancy than menstruating women, the pelvic ligaments and abdominal skin of menstruating women are relaxed, especially before 24 weeks the height of the fundus of menstruating women is significantly higher than that of primigravida, sometimes greater than the height of the same pregnancy week; 5, the position of the uterus may be more backward, that is, the uterus is posterior, pregnancy Afterwards, the uterus enlarges and most of the uterus tilts toward the pelvis as well as grows posteriorly in the abdomen, so it is not obvious in the abdomen. Second, pathological reasons such as intrauterine growth retardation or low amniotic fluid, the uterus volume is relatively small and the pregnancy is not obvious. As long as the ultrasound indicates that the size, growth and development of the fetus are in accordance with the pregnancy week and no other abnormalities are seen, there is no need to worry too much and regular prenatal checkups can be done.