Definition: The early stages of pregnancy, from fertilization of the egg by the sperm and implantation through approximately the eighth week of pregnancy.
Embryo
By Nicole Galan, RN, About.com Guide
Updated April 22, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Explore PCOS
Must Reads
About.com Special Features
8 Ways to Cut Drug Costs
Learn how to save money on medications with these recommendations. More >
Healthy Bodies, Healthy Minds
Keep yourself, and your family, happy and healthy this fall with these tips. More >
Also from About.com:
©2009 About.com, a part of The New York Times Company.
All rights reserved.