Last month I had period on 24thdec .then after in 9th of period (1st Jan)I had a sex  with Protection but also I took ipill befor 24 hrs .this was my first time but in 6th day on 8th Jan I had a beeling but not as much before .it was for 4 days.but this month I missing my period .its been a week but I have no period .is there any chance of pregnency or its ipills effect? Now when can I predict my next period?