Pregnancy begins with conception, which is the fertilization of an egg by a sperm. This occurs when sperm from the man's ejaculate enters the woman's vagina and travel through the cervix, uterus, and into the fallopian tubes. If one of the sperm fertilizes an egg, the fertilized egg, or zygote, begins to grow and develop.

Implantation

After conception, the zygote travels through the fallopian tubes and into the uterus. It takes about 3-4 days for the zygote to reach the uterus. Once there, it implants into the lining of the uterus, a process called implantation. Implantation usually occurs 6-12 days after ovulation, which is the release of an egg from the ovary.

Embryonic Development

During the embryonic development stage, which lasts from implantation to the eighth week of pregnancy, the major organs and body systems of the baby form. The embryo's heart begins to beat, and the neural tube, which eventually becomes the brain and spinal cord, develops. The embryo also develops buds that will become the arms and legs.

Fetal Development

At the end of the eighth week, the embryo is officially called a fetus. The fetal development stage lasts from the ninth week of pregnancy until birth. During this time, the fetus grows and matures rapidly. The organs continue to develop, the limbs become more defined, and the fetus begins to move and kick. The fetus also develops hair and nails.

Stages of Pregnancy

Pregnancy is divided into three trimesters, each lasting about 12 weeks.

First Trimester

The first trimester begins at the start of pregnancy and ends at week 12. During this trimester, the embryo implants into the uterus and begins to develop major organs and body systems. The most common early pregnancy symptoms include morning sickness, fatigue, and breast tenderness.

Second Trimester

The second trimester begins at week 13 and ends at week 28. During this trimester, the fetus grows rapidly and begins to move and kick. The mother's belly will begin to show, and she may experience new symptoms such as heartburn, constipation, and swelling.

Third Trimester

The third trimester begins at week 29 and ends at week 40. During this trimester, the fetus continues to grow and mature. The mother's body prepares for labor and delivery, and she may experience new symptoms such as back pain, frequent urination, and contractions.

Labor and Delivery

At the end of the third trimester, the mother will go into labor. This is when the baby is born through the vagina. The first stage of labor is the longest and involves strong contractions that help to open the cervix. The second stage of labor is when the baby is born. The third and final stage of labor involves the delivery of the placenta.

Postpartum Period

After giving birth, the mother will enter the postpartum period. This is a period of recovery that lasts for several weeks. During this time, the mother will experience changes in her body and hormones, and she may face physical, emotional, and mental challenges.