on 13 april i had a protected sex with condom,he also ejaculated outside my body, then for more safety i had taken emergency pill,it was a 2-3 days side effects of the pill including vommiting,lower abdominal pain.but it gone way,except some irregular pain at the lower abdomain on left,my expected day of period was 26,it came on 28 april,stayed for 3 days.in this month,for 1 or 2 days,i had the lower pain,what is the reason?? is there anything to worry about??pls help