A colon polyp is a small clump of cells that forms on the lining of the colon. Most colon polyps are harmless. But over time, some colon polyps can develop into colon cancer, which is often fatal when found in its later stages. Anyone can develop colon polyps. You're at higher risk if you're 50 or older, are overweight or a smoker, or have a personal or family history of colon polyps or colon cancer. Colon polyps often don't cause symptoms.
A pregnancy is divided into trimesters: 1  the first trimester is from week 1 to the end of week 12. 2  the second trimester is from week 13 to the end of week 26. 3  the third trimester is from week 27 to the end of the pregnancy.
A normal pregnancy usually lasts about 40 weeks, counting from the first day of a woman's last menstrual period, which is typically about two weeks before conception occurs. The stages of pregnancy are typically described in three-month periods known as trimesters. Each trimester lasts between 12 and 13 weeks. During each trimester, distinct changes take place in a pregnant woman's body as well as in the development of the fetus, and they will be described in greater detail below.