Yes, having your period during the test doesn't interfere with the accuracy of the results. See also: Is It Actually Possible for You to Get Pregnant While on your Period?
Read the full article on: When should you take a pregnancy test for it to be reliable? ( 51).
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.