I started BC(ocella) last month, throughout the whole month I experienced nausea until the last week of the different color pills,my cycle came, the pack ended on saturday and so did my cycle...I missed the first pill of the new pack on sunday and had unproteted sex,so I doubled up on monday, experienced vomiting allday tuesday, monday was the last pill I took, still feeling nausea , seen spotting on today(2/1/09), could I be pregnant.