Final answer:
The time from conception to 14 days of prenatal development is known as the germinal stage. This stage lasts about two weeks and involves rapid cell division.
Step-by-step explanation:
The time from conception to 14 days of prenatal development is known as the germinal stage. This stage lasts about two weeks and begins with fertilization and ends with implantation in the lining of the uterus. During this stage, the zygote undergoes rapid cell division.