Final answer:
Pregnancy can result from the failure of birth control methods leading to fertilization of an egg and implantation in the uterus.
Explanation:
Pregnancy is the result of fertilization of an egg by sperm and implantation in the uterus. Failure of birth control methods like barrier methods, natural family planning, or withdrawal can lead to pregnancy. For a successful pregnancy, the egg must be released, travel through the Fallopian tube, get fertilized, and implant in the uterus.
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