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.
Pregnancy is broken down into weeks, and is divided into three parts called trimesters. Full term pregnancy is considered 40 weeks and an infant delivered before the 37th week completed is considered premature. Pregnancy is counted from the first day of a your last period. This means that at conception, you are already considered two weeks pregnant. The first, second, and third months are the first trimester of pregnancy. For more information on development, use the drop down menus above or the weeks links below. 2 weeks after the first day of the last normal menstrual period-The sperm and egg join in the fallopian tube and fertilization has occurred. A single sperm penetrates the mother's egg cell, and the resulting cell is called a zygote. The zygote contains all of the genetic information (DNA) necessary to become a child.