Final answer:
Lesa is in the germinal stage, which is the earliest stage of pregnancy lasting about a week from fertilization until implantation in the uterus.
Step-by-step explanation:
Lesa is in the germinal stage of her pregnancy. The germinal stage is the first and shortest stage of the human lifespan and is an essential part of prenatal development.
Lasting from fertilization until implantation in the endometrium of the uterus, this stage typically spans about a week. During this period, the newly fertilized egg, also known as a zygote, begins to divide and travel down the fallopian tube towards the uterus where it will implant and begin to grow.
This stage leads to the embryonic period, where the embryo will continue to develop until it reaches the fetal stage.