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Find week by week information for pregnancy, fetal development images, helpful tools and a free newsletter that follows your pregnancy week by week. Pregnancy (latin “graviditas”) is the carrying of one or more offspring, known as a fetus or embryo, inside the womb of a female. In a pregnancy. The pregnancy guide can help you find information on pregnancy and childbirth, including a week by week pregnancy calendar, signs of pregnancy. This section of womenshealth.gov will help you learn what you can do before, during, and after pregnancy to give your baby a healthy start