Intercourse and i-pill during periods.

I had an unplanned intercourse on day-2 of my periods (19th February) with my boyfriend. Within 4-5 hours of this intimacy, i had an i-pill emergency. Usually, i have heavy periods untill day-2 or 1st half of third day; and then it recede gradually ending completely by the end of day-5. But this time i had heavy periods until yesterday (24th Feb) and i also had muscle cramps and was mildly nauseous (21st Feb). Now i have completely light bleeding which has almost finished. Since I am completely inexperienced and unaware about any situation and i dont want to get pregnant in any case, could you advise me? Is there any chances that i am pregnant or i might get pregnant? If yes, what more precautions should I take, since I might suffer drastic family situation? I seek medical advice and assistance at the earliest. Thanking you.