Upto 13 weeks
During this trimester, the body undergoes a lot of rapid changes with the growth of the amniotic sac which forms a protection over the fertilized egg, the placenta that provides nutrition to the baby and the umbilical cord which carries the nutrition to the fetus. While your stomach does not start showing this early into the pregnancy, you may experience one or more of the following symptoms. The duration for which these symptoms are experienced may vary from person to person.
A surge in the hormones in the body can cause mood swings, fatigue and morning sickness (nausea and vomiting). Though morning sickness subsides after the first trimester for most pregnant women, some women are known to experience morning sickness throughout their pregnancy. Despite the name, morning sickness can be experienced at any time of the day and sometimes multiple times during a day. You may also experience tenderness in the breast with the areolas becoming enlarged and darkened and being covered with small, white bumps. Some women also experience constipation, heartburn and indigestion and an increased urge to urinate. There is not much of a weight gain during the first trimester.