Hello, Thanks for sharing your health concern with us. The efficacy rate of emergency contraceptive pill decreases as the duration of intake from the unprotected intercourse increases. However, as you took the pill within the stipulated time, you are well protected, the range is around 85%. In addition, if you are in your safe or non-ovulation period during the intercourse, you are naturally protected. Ovulation occurs two weeks prior to the onset of the next menstrual period and this is when conception can happen. Hope this helps.