All of the following are mechanisms of action of emergency contraception, EXCEPT:

Mechanism of action of emergency contraception or post coital contraception includes : prevention or producing a delay of ovulation by taking the drug in the beginning of cycle, interfering with the process of feilization, prevention of implantation by rendering the endometrium unorable and by interfering with the function of corpus luteum. Ref: Textbook of Obstetrics By D.C. Dutta, 6th Edition, Page 549