How large is an embryo at the end of eight weeks?

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Close-up of a home pregnancy test device showing a blue plus sign in the result window, indicating a positive result for pregnancy. — pregnancy Devices for individual use at home detect pregnancy by measuring levels of the hormone human chorionic gonadotropin (hCG) in urine.

At the end of eight weeks of development, an embryo is approximately 25 to 30 mm (about 1 to 1.2 inches) in length.12

By this stage, the embryo has acquired recognizable human external features, and the majority of its internal organs are well established. Following the conclusion of this eighth week, the developmental stage of the embryo ends, and the developing organism is referred to as a fetus for the remainder of the pregnancy.12