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Mature pregnant woman

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The start of pregnancy is actually the first day of your last menstrual period. This is called the 'menstrual age' and is about two weeks ahead of when conception actually occurs. Each month a group of eggs called oocytes is recruited from the ovary for ovulation release of the egg. The eggs develop in small fluid-filled cysts called follicles. Normally, one follicle in the group is selected to complete maturation.

This dominant follicle suppresses all the other follicles in the group, "Mature pregnant woman" stop growing and degenerate. The mature follicle opens and releases the egg from the ovary ovulation. Ovulation generally occurs about two weeks before a woman's next menstrual period begins. After ovulation, the ruptured follicle develops into a structure called the corpus luteum, which secretes progesterone and estrogen. The progesterone helps prepare the endometrium lining of the uterus for the embryo to implant.

On average, fertilization occurs about two weeks after your last menstrual period. When the sperm penetrates the egg, changes occur in the protein coating around it to prevent other sperm from entering. At the moment of fertilization, your baby's genetic make-up is complete, including its sex.

If a Y sperm fertilizes the egg, your baby will be a boy; if an X sperm fertilizes the egg, your baby will be a girl. Human chorionic gonadotrophin hCG is a hormone present in your blood from the time of conception. It is produced by cells that form the placenta and is the hormone detected in a pregnancy test. However, it usually takes three to four weeks from the first day of your last period for the hCG to increase enough to be detected by pregnancy tests.

Within 24 hours after fertilization, the egg begins dividing rapidly into many cells. Mature pregnant woman remains in the fallopian tube for about three days. The fertilized egg called a blastocyte continues to divide as it passes slowly Mature pregnant woman the fallopian tube to the uterus where its next job is to attach Mature pregnant woman the endometrium a process called implantation.

Before this happens, the blastocyte breaks out of its protective covering. When the blastocyte establishes contact with the endometrium, an exchange of hormones helps the blastocyte attach. Some women notice spotting or slight Mature pregnant woman for one or two days around the time of implantation. The endometrium becomes thicker and the cervix is sealed by a plug of mucus. Within three weeks, the blastocyte cells ultimately form a little ball, or an embryo, and the baby's first nerve cells have already formed.

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Your developing baby is called an embryo from the moment of conception to the eighth week of pregnancy. After the eighth week and until the moment of birth, your developing baby is called a fetus. The development stages of pregnancy are called trimesters, or three-month periods, because of the distinct changes that occur in each stage.

As the fertilized Mature pregnant woman grows, a water-tight sac forms around it, gradually filling with fluid. This is called the amniotic sac, and it helps cushion the growing embryo. The placenta also develops.

The placenta is a round, flat organ that transfers nutrients from the mother to the baby, and transfers wastes from the baby. A primitive face will take form with large dark circles for eyes.

The mouth, lower jaw, and throat are developing. Blood cells are taking shape, and circulation will begin. The tiny "heart" tube will beat 65 times a minute by the end of the fourth week. Your baby's facial features continue to develop.

Each ear begins as a little fold of skin at the side of the head. Tiny buds that eventually grow into arms and legs are forming. Fingers, toes and eyes are also forming. The neural tube brain, spinal cord and other neural tissue of "Mature pregnant woman" central nervous system is well formed. The Mature pregnant woman tract and sensory organs begin to develop.

Bone starts to replace cartilage. Your baby's arms, hands, fingers, feet, and toes are fully formed.

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