Yes, one of the indications for taking the morning-after-pill is to have forgotten one of the contraceptive pills for a period of more than 24 hours and to have had unprotected sexual intercourse.
It is very important to keep an exhaustive control of the oral contraceptives so as not to forget any dose.
Read the full article on: Morning-after pill: what are its effects and cost? ( 65).

Zaira Salvador
B.Sc., M.Sc.
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)
License: 3185-CV