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Understanding Conception

Pregnancy begins when a woman’s egg and a man’s sperm join. This is known as conception or fertilization.

Illustration of female reproductive system

The Woman’s Role in Conception

Each month, one of a woman’s ovaries releases a mature egg (ovulation). The egg travels to the fallopian tube. If sperm are present, one of them may join with the egg to form an embryo. The embryo then travels to the uterus. There it implants in the uterine lining, where it grows to become a baby. If conception doesn’t occur, the egg and the uterine lining are shed during your period (menstruation). A new cycle begins.

Illustration of male reproductive system

The Man’s Role in Conception

Sperm are produced in a man’s testicles. Fluid produced by the prostate gland combines with sperm to form semen. During a man’s orgasm, semen flows through the vas deferens to the urethra and out of the penis (ejaculation). If the semen was ejaculated in or near a woman’s vagina, sperm may travel into the uterus and the fallopian tubes. There, a sperm may join a mature egg to form an embryo. This results in pregnancy.

 

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