i had sex with my girlfriend about a month back , it was unprotected i dint ejaculate inside her. she took ipill just 4 to 5 hours after that. 4 to 5 day later she had vaginal bleeding, dunt no if they where periods as it wasnt her proper date. but till today she dint have her periods .we did a home pregnancy urinary test. it was negative.whats the problem shes not geting her periods its delayed by more than 10 to 12 days, cud she be pregnant ?