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Embryo implantation and pregnancy test
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Embryo implantation and pregnancy test

When the embryo attaches to the uterus, which takes place around the fourth week of pregnancy approximately, it starts releasing hCG hormone.

hCG is the hormone that is responsible for the first pregnancy symptoms, including morning sickness and nausea. On the other hand, beta-hCG is the hormone detected by pregnancy tests. When hCG is detected, pregnancy tests show a positive result.

By BSc, MSc (embryologist) and BA, MA (fertility counselor).
Last Update: 02/21/2018
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