Although each pregnancy is unique, certain changes are common to all normal pregnancies. A basic understanding of physical and emotional changes of pregnancy helps a woman to understand pregnancy and have a positive experience. During the first trimester evidence of pregnancy is limited to missing a period and to the word of the care giver that the pregnancy test is positive.
Some physical changes are apparent, such as fatigue, nausea, vomiting and breast tenderness.
These symptoms are common and vary in intensity. Emotions are often unstable and feelings of depression are not uncommon, often for no apparent reason. It is commonly believed that the mood changes in pregnancy are caused by hormonal changes. The two main hormones that play a major role in pregnancy are estrogen and progesterone. A woman's emotions are characterized by mood swings, which can range from great joy to deep despair.