After pregnancy, due to the secretion of estrogen and progesterone in the body will stimulate the expansion of the mammary gland ducts and the development of the glandular alveoli, most women will have breast enlargement and breast swelling, which is the early pregnancy reaction of pregnancy, and a few women are pregnant without breast swelling is normal. The easiest way to determine whether you are pregnant or not is to use a morning pregnancy test paper to test whether you are pregnant. If you see a fetal sac in the uterine cavity, it means you are pregnant. You can’t tell if you are pregnant by the symptoms of chest distension, but you need to confirm the diagnosis by laboratory tests or ultrasound.