hCG is rapidly secreted after embryo implantation, which takes place around 6 days after conception. Once it kicks in, hCG levels double every two or three days. As explained above, it can be detected by a blood test about 11 days after conception, and 12-14 days if you use a HPT.
When is hCG produced after conception?
By Andrea Rodrigo B.Sc., M.Sc. (embryologist).
Last Update: 10/20/2017
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.