How is it that chest tightness, shortness of breath and dyspnea sometimes occur in eight months of pregnancy?

I'm a little short of oxygen. In the third trimester, the fetus is getting bigger and bigger, which will oppress various organs of the mother. It is normal to feel a little chest tightness and shortness of breath. I stay in a place with few people and ventilation. I was pregnant, too. I couldn't breathe when it was hot. It's okay. The last month of pregnancy is hard, but everything will be fine. Come on, I wish you health and happiness!