Hello, Pregnancy can occur in a regular cycle, if unprotected intercourse occurs around the fertile or ovulation period, which is two weeks prior to the date of next menstruation. If you had the intercourse during the non-ovulatory or safe period, you are protected naturally. Also, since you took the complete course of emergency contraception, the medication stays in the body for five days and hence there is no need for another pill. Moreover, recurrent intake of such pills creates hormonal disturbances leading to fertility problems in future. Please practice regular contraception in future. Hope this helps.