Pregnancy Trimesters 1,2 & 3 Explained

This article explores the key aspects of the first, second, and third trimesters, along with common symptoms.
First Trimester (Weeks 1-12)
The first trimester is a period of rapid development and significant hormonal changes. For many women, it begins with the realization of a missed menstrual period. Early symptoms often include tender, swollen breasts, fatigue, frequent urination, and morning sickness—nausea that can occur at any time of day. Hormonal shifts may also cause mood swings and heightened emotions.

During this trimester, the fertilized egg implants in the uterine wall, and the embryo begins to develop. By the fifth week, the heart starts to beat, and the neural tube, which becomes the brain and spinal cord, is forming. By the end of the twelfth week, the embryo transitions into a fetus, with major organs and structures, including fingers, toes, and facial features, beginning to take shape.
Second Trimester (Weeks 13-26)
he second trimester is often considered the most comfortable period of pregnancy. Many women experience a decrease in morning sickness and an increase in energy. The baby bump becomes more pronounced as the uterus expands, and you may begin to feel the baby move, often described as flutters or quickening. Skin changes, such as the appearance of stretch marks and Linea nigra (a dark line running down the abdomen), are common.
During this trimester, the baby's organs continue to develop and mature. By the seventeenth week, the baby can hear sounds, and you might feel its movements. By the twenty-fourth week, the baby’s lungs and taste buds are developing, and it starts to gain more weight.
Third Trimester (Weeks 27-40)
The third trimester brings the most significant physical changes as the baby grows rapidly. Common symptoms include back pain, swelling in the ankles and feet, and Braxton Hicks contractions—irregular, usually painless contractions that prepare the body for labor.