What are the reactions in the first month of pregnancy? The first month of pregnancy is a sensitive period for pregnant women. At this time, the fetal organs begin to develop and the hormone levels in the pregnant woman\’s body also change, so some early pregnancy reactions will occur. Common early pregnancy reactions include nausea, vomiting, fatigue, dizziness, changes in appetite, chest discomfort, low back pain, etc. First of all, nausea and vomiting are common discomfort symptoms in early pregnancy. This is due to increased hormone levels in pregnant women. Ways to relieve nausea and vomiting include: eating more frequent smaller meals