A woman’s fertility depends on her menstrual cycle. The menstrual cycle changes are caused by hormones, substances produced by the body to control certain functions. During each cycle, hormones cause the lining of the uterus to build up and an egg to mature in a follicle – tiny clusters of cells in the ovaries. When an egg is mature, it is released from the ovary. This process is called ovulation.

Average menstrual cycles last about 28 days, however, cycles of 23-35 days are normal and may vary month to month. You may wish to keep a diary of your cycle, counting from the first day of one period to the first day of the next. This will help track your normal ovulation cycle – and it can also help to better determine a due date for the baby if you do become pregnant.

Ovulation occurs about 14 days before the next period. After ovulation, the egg moves down one of the fallopian tubes toward the uterus. If the egg is not fertilized, it is absorbed by the lining of the uterus. Then, on the last day of the cycle, the lining of the uterus is shed as menstrual fluid.

If the egg is fertilized, it becomes attached to the lining of the uterus. The fertilized egg starts to grow as pregnancy begins.

The union of egg and sperm that results in pregnancy is called fertilization. Once an egg is released, it can be fertilized by a sperm.

Sperm cells are made in a man’s testes, in the scrotal sac below the penis. When the sperm cells mature, they leave the testes through small tubes called the vas deferens. As sperm move from the testes, they mix with fluid made by the seminal vesicles and prostate gland, small organs located near the bladder. The mixture of sperm and fluids is called semen. When the man ejaculates or climaxes during sex, semen moves through the urethra, a tube in the penis, into the vagina. A woman does not have to climax to become pregnant.

When a man ejaculates into the vagina, sperm move up through the cervix, into the uterus, and out into the fallopian tubes. Sperm live two to three days or longer. If a sperm joins with an egg in one of the tubes, fertilization occurs.

Sperm cells are made throughout a man’s life cycle, all the time. Some couples may worry that having sex too often will reduce the number of sperm and make it hard to become pregnant. However, daily intercourse should not be a problem if the man has produced enough sperm. The sperm count is the number of active sperm in a milliliter of semen – a normal sperm count is between 20 million and 250 million..

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