Final answer:
The stage of family development that starts with conception and continues through pregnancy is known as the expectant stage, beginning with the germinal stage and proceeding through the embryonic and fetal stages.
Step-by-step explanation:
The stage of family development that begins when conception occurs and continues through the pregnancy is known as the expectant stage. The very beginning of this stage is marked by the germinal stage of prenatal development, which starts with fertilization and lasts about two weeks. This is followed by the embryonic stage, lasting until the end of the 8th week, during which time the embryo undergoes significant growth and organ development. Subsequently, the fetal stage begins at the 9th week and continues until birth, with further development and growth of the fetus, preparing it for life outside the womb. It is crucial for expectant parents to seek prenatal care throughout these stages to ensure the health of both the mother and the developing baby.