The period of the embryo begins atand ends withwhich takes about

The first 2 weeks of development is the germinal period. The germinal period begins with conception and ends when the blastocyst is fully placed into uterine tissue. Next, the embryonic period lasts from implantation until about 8 weeks from the time of conception.

Explanation:

The third thru the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.