Pregnancy is the term used to describe the period in which a fetus develops inside a woman's womb or uterus.
Pregnancy usually lasts about 40 weeks, or just over 9 months, as measured from the last menstrual period to delivery. Health care providers refer to three segments of pregnancy, called trimesters.
Link to article: https://www.nichd.nih.gov/health/topics/pregnancy/conditioninfo#:~:text=Pregnancy%20is%20the%20term%20used,segments%20of%20pregnancy%2C%20called%20trimesters.