What Causes Excess Bleeding With Clots After Taking I-pill?

Hello doctor,I am of 21 year old and had my period finished on 27th of dec 2014, on 1st of jan 2015 i had sex with my bf although he has not come inside but for safety concern i had taken ipill under 12hrs but from 8th of jan it start bleeding some time it was heavy with blood clots and still it was more than 11 days but it was not stopped although bleeding is not too much as i was initially but it is not stopping can u plz plz help me is this normal with ipill , i also can't tell this to my parents plz help plz plz