i had unprotected sex 18days back and my periods were due on the 25th.i took an I-Pill within 48 hours. i normally have regular periods with a delay of 1 or 2 days but i haven't started menstruating yet. in fact there was some freakish bleeding for about a few hours on 23rd night and after that nothing! i do continue to have some vaginal discharge that was dark brown but has now turned to white and its continuous.Am i pregnant?