I have periods for one or one and half days and have breast pain but it's never delayed

Hi ....I'm going through alot of stress please help me to understand .. I had a protected sex with my boyfriend as he was wearing condom and it did not break or slipped but since it was my first time I also took ipill to be double safe it was on 14/11/2014 it was probably one week after my period ...and again after ten days of my first sex we again had sex with condom again I was scared of pregnancy so I took the ipill again ...after few days before my expected date of menstrual cycle I had period for one day that is on 2/12/2014after three or four days again we had sex and again I took ipill and after ten days of my sooner period I had period for one day that is 12/12/2014....usually I have periods for one or one and half days and have breast pain but it's never delayed than my expected date and now it's passed my both days I haven't had periods I'm two days late and there is no sing of my periods I'm only having breast pain for two weeks ...do you think I could be pregnant ? As my boyfriend says I'm safe but still I'm scared as my period is late for two weeks ...please tell me what this could be it's urgent