40 days pregnant stomach will not obviously increase, in 40 days pregnant, the embryo has just landed in the uterine cavity, the uterus is also slightly enlarged still in the pelvis, has not yet grown out of the pelvis outside, the stomach will not become bigger. In the first 40 days of pregnancy, some more sensitive women, there will be a feeling of lower abdominal distension, thinking that the stomach increases, measurement does not appear to increase abdominal circumference, women pregnant, the stomach increases is in the third month of pregnancy, the uterus enlarged outside the pelvis, during the period of fetal growth and development is faster. Women’s diet is also more, more likely to have more abdominal fat, weight will increase, the stomach will obviously increase, 40 days pregnant, women need to check the blood HCG, progesterone and gynecological ultrasound, to check the development of the embryo is in line with the gestational week.