Pregnant women’s shortness of breath in early pregnancy is related to endocrine hormones in the body. After pregnancy, the estrogen and progesterone in the body will increase, and under the influence of endocrine hormones, the mucous membrane of the respiratory tract of pregnant women will be congested and edematous, and pregnant women will have some symptoms similar to the early stage of the flu. After pregnancy, the metabolism increases, the lung gas exchange will also increase, the enlarged uterus will push the diaphragm upward, pregnant women mainly take chest breathing, like deep and long breaths to increase gas exchange, so it is normal for pregnant women to be a little out of breath in the early stage of pregnancy. Around 6 weeks of pregnancy, pregnant women will have early pregnancy reaction, mainly morning sickness, nausea, dizziness, chest tightness, drowsiness and weakness. The early pregnancy reaction will ease or disappear in more than 3 months of pregnancy. If the symptoms do not ease or worsen, you should go to the hospital for examination in time.