Final answer:
The term for a woman being or having been pregnant is "pregnancy." Pregnancy includes carrying an embryo or fetus in the uterus for about 40 weeks, divided into trimesters with various developmental stages.
Step-by-step explanation:
The term that means a woman is or has been pregnant is "pregnancy." Pregnancy is the period in which a woman carries one or more offspring from fertilization until the birth process. It involves the development of either an embryo or a fetus within the woman's uterus. An embryo is the term used for the developing baby during the early stages of pregnancy, specifically until the end of the 8th week after fertilization. Following this period, the term fetus is used until the baby is born. Pregnancy also includes variations such as surrogacy, where a surrogate mother carries the baby to term for another individual or couple.
The average pregnancy lasts around 40 weeks, typically divided into three trimesters, with distinctive physiological changes and developmental milestones occurring in each trimester. The protective environment of the uterus allows the fetus to grow and develop, while the mother's body undergoes significant changes to accommodate and nurture the fetus.