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Pregnancy Week 1
Wikipedia
Most women don’t yet realize they’re pregnant at week 1, but start to wonder once they’ve missed their period within two weeks or start feeling tired or crave certain foods. Week one is counted as the first week of your last menstrual period before you became pregnant.
What happens to the baby?
Every month, halfway through a women’s menstrual cycle (day 14 of a 28-day cycle), the body produces an egg that is released from the ovaries through the fallopian tube and into the uterus. This egg will need to be fertilized—fused with a male sperm—within 12–24 hours to become pregnant. If the egg is not fertilized within that time, it will pass through the vagina along with the shedding of the lining of the uterus; this is your period. Once the egg is fertilized it begins to split over and over again until a small cluster of cells is formed. By day 4 there are usually over 100 cells. This is called the embryo.
Return to Pregnancy Calendar or continue to Week 2
Resources
Stoppard, Miriam. "Dr. Miriam Stoppard’s New Pregnancy and Birth Book.” Ballantine Books. 2009. The American College of Obstetricians and Gynecologists. “Your Pregnancy and Birth.” Meredith Books. 2005. Stone, Joanne; Eddleman, Keith; Duenwald, Mary. “Pregnancy for Dummies.” Wiley Publishing. 2004.