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.
Full term pregnancy is considered 280 days counted from the first day of a your last period. This is broken down into 40 weeks, or divided into three equal parts called trimesters. The fourth, fifth, and sixth months are the second and middle trimester of pregnancy. For more information on development, use the drop down menus above or the weeks links below. 13 weeks - The fetus is now 3 inches long and weighs just an ounce. The baby's unique fingerprints are already in place.