sentence: Pregnancy is divided into three parts called 'trimesters'.
sentences_after: Each trimester is about three months long. During the first trimester, the woman often feels sick in her stomach and has to urinate often. During the second trimester, the woman's body starts to look pregnant, and her belly starts to stick out. During the third trimester, her belly sticks out even more, and the woman becomes even heavier. Many other things happen to the woman during pregnancy.
concept_name: pregnancy
headings: Pregnancy
categories: Biological reproduction