URMC / Encyclopedia / Content Search Encyclopedia Pregnancy Click on the links below to learn more about this topic. Pregnancy Overview Anatomy: Fetus in Utero The First Trimester (0 - 12 Weeks) The Second Trimester (12 - 24 Weeks) The Third Trimester (24 - 40 Weeks) The Pregnant Mother Hormones During Pregnancy Weight Gain During Pregnancy Nutrition During Pregnancy Exercise During Pregnancy Work and Pregnancy Sex During Pregnancy Sleeping During Pregnancy Multiple Pregnancy Overview of Multiple Pregnancy Symptoms and Diagnosis of Multiple Pregnancy Complications of Multiple Pregnancy Care and Management of Multiple Pregnancy Newborn Multiples