All of the following must happen in order for a female to become pregnant: The ovary must release (ovulate) an egg The egg must be captured by the Fallopian tube Sperm must travel through the vagina, into the uterus, and up into the Fallopian tube Sperm has to fertilize the egg The fertilized egg, or embryo, must travel down to the uterus The embryo must implant in the uterine lining and begin to develop