1. Physiological changes during pregnancy At 15 weeks of pregnancy, the fetus has grown to about 10 centimeters long and weighs about 70 grams. At this time, hormone levels in the pregnant woman\’s body will continue to rise, leading to a series of physiological changes in the body. , the breasts will become more sensitive and the areola color will deepen; they will also continue to expand as the fetus grows, and you may feel