Why is it possible for an egg to be fertilized in the pelvic cavity of a female instead of her reproductive tract?

Because fallopian tubes can be damaged. When this happens, the egg is fertilized in the pelvic cavity.

Explanation:

A common pregnancy begins with a fertilized egg. Normally, the fertilized egg attaches to the lining of the uterus and is fertilized in the reproductive tract. However, in some cases egg fertilization occurs in the pelvic cavity.  When the egg is fertilized in the pelvic cavity, the gradation cannot proceed normally. The fertilized egg does not survive, and the growing fetus can destroy various maternal structures. If left untreated, there is a risk of bleeding, which can be fatal. Early treatment of this type of pregnancy can help preserve fertility.

Fallopian tube damage is a common cause that causes fertilization in the pelvic cavity. A fertilized egg can be parked in a damaged area of a tube and begin to grow there. The most common causes of fallopian tube damage include:

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