The 19th week of pregnancy plus one day feel heavy stomach, a little out of breath the most common reason for pregnancy uterus enlargement so that the stomach for the feeling of heaviness, circulating blood volume increases so that the heart load increases and thus show chest tightness, this is the body to the state of the fetus can not adapt to the increase in size, these symptoms will generally gradually improve. At 19 weeks of pregnancy, the position of the uterus has moved from the pelvic cavity to the abdominal cavity, while the fetus is gradually increasing in size, the amniotic fluid will also be more, which will be manifested as a feeling of heaviness in the stomach, if it is not accompanied by abdominal cramps, lumbosacral pain, and vaginal bleeding, it is normal. When this stage of pregnancy appears a little breathless feeling belongs to chest tightness, may be the body does not adapt to the uterus enlargement and progesterone levels rise caused by the increase in circulating blood will be manifested as chest tightness. You can go for a walk in the fresh air at this time, and this symptom will disappear on its own. However, routine pregnancy checkups should be performed to rule out heart disease in pregnancy. Pregnant women who are 19 weeks plus one day pregnant with a heavy feeling in the stomach, chest tightness symptoms progressively aggravated, may also be other reasons, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to determine the cause of the disease and related treatments.