How pregnant women should stay healthy. The 40th day of pregnancy is the early stage of pregnancy. The normal progesterone level measured at this time is 10-50ng/mL. Progesterone is an important hormone that maintains the progress of early pregnancy. Insufficient secretion of progesterone can cause pregnancy osteoma and easily lead to miscarriage. At this stage, pregnant women should take a series of measures to maintain physical health to ensure normal embryo implantation and normal pregnancy progress. Dietary Precautions Pregnant women should pay attention to their diet and avoid