There is no relationship between colds and pregnancy, so the appearance of colds in women is not a sign of pregnancy. The following clinical manifestations may occur after a woman becomes pregnant: First, early pregnancy reactions such as nausea, vomiting, weakness and drowsiness may occur, which are mainly related to the increase of blood chorionic gonadotropin level after a woman becomes pregnant. Second, there may be swelling and pain in the breasts, deepening and enlarging of the areola, easy erection of the nipples and other reactions, which are mainly related to the increase of estrogen and progesterone levels after pregnancy, and individual patients may have nipple overflow in early pregnancy due to the increase of prolactin. It is a pathological state, while pregnancy is a physiological state, so there is no connection between the two.