Pregnancy tests cannot detect a miscarriage. However, because these days tests are able to detect very low levels, they may show a positive result in spite of having miscarried. hCG levels can still be high in the days or even immediate weeks after your miscarriage.
Learn more: hCG Levels After a Miscarriage or a Medical Abortion.
Read the full article on: When should you take a pregnancy test for it to be reliable? ( 55).

Andrea Rodrigo
B.Sc., M.Sc.
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.