Pregnancy occurs when a sperm fertilizes an egg after it is released from the ovary (ovulation). Ovulation occurs at the midpoint of your menstrual cycle, and results in the egg’s migration into one of your fallopian tubes where it may be fertilized by sperm. The fertilized egg then travels down into the uterus where implantation occurs. A successful implantation results in pregnancy, a process that lasts an average of 40 weeks. While the process sounds straightforward, there are many factors that can affect a pregnancy. Women who receive an early diagnosis and prenatal care are more likely to experience a healthy pregnancy and give birth to a healthy baby.