Dear Ma'am, You can't know weather u have conceived till your next missed period. I have noted your request for emergency contraception and as you have been an IUCD user it would be best to make sure that the IUCD is inserted within 5 days of day of first unprotected intercourse. Since the days of unprotected intercourse are within the first week of menstrual cycle your chance of conception is minimal. However 7 days have passed since your first day of unprotected intercourse, so efficacy of emergency contraception would be less. Alternatively, you could practice barrier contraception in this cycle and use regular COC's or insert an IUCD after the next menstrual cycle.  Most importantly you must do a Urinary pregnancy test if you miss the next period. Regards, Aditi