Generally the stomach does not get bigger in the second trimester.
Early pregnancy because the uterus is still in the pelvic cavity, so in the second trimester of pregnancy stomach is generally not bigger, but due to the body’s hormone levels rise, some pregnant women may be in the early pregnancy abdominal bloating and other symptoms. Generally, after the uterus protrudes from the pelvis in the 4th or 5th month of pregnancy, some pregnant women’s tummies will get bigger and make their abdomens bulge.
As the weeks of pregnancy increase and the uterus enlarges, abdominal distension will become more and more obvious. The height of the uterine fundus can be measured to estimate the size of the fetus and the week of pregnancy, but the height of the uterine fundus is affected by the development of the fetus, the amount of amniotic fluid, a single fetus and other factors, and there will be differences in the same week of pregnancy, so you can use ultrasound to check the week of pregnancy.