I had intercourse with my bf on 7 December 2016. I think he ejaculated inside me but after having intercourse within 9 hours I took i-pill but reason for me to be here is that my period have become irregular sometime its early sometime its from from last three months and this months due date has come but periods didn't happened .so I a worried that am I pregnant or if no then what is the reason for irregular periods and also I had taken home pregnancy test after second cycle and the result was negative.