No, in principle the initial values do not vary. The embryo, once implanted, initiates the release of the beta-hCG hormone, regardless of the site of implantation.
However, the evolution of the hormone value may vary, since in an ectopic pregnancy there will come a time when the embryo stops its development and this blocks the release of the beta-hCG hormone, which will progressively decrease its level in the maternal blood.
Therefore, although initially, the beta-hCG test would not be helpful in detecting ectopic pregnancy, at a more advanced stage, it can be important.
Read the full article on: What Are Normal hCG Hormone Levels during Pregnancy? ( 61).
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.