Yes, in fact, birth control pills are one of the causes that lead to cryptic pregnancy. No contraceptive is foolproof, and the pill is no different.
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.