I had unprotected sex on the 30th and 31st of last month but I used ampiclox right after to avoid pregnancy,my period is suppose to com between 11th and 13th of this month but its not here and no signs of it coming cos I do get signs when its coming,I also did urine test yesterday morning nd it was negative,I can't stop thinking about it I'm so worried to death right now,can I be pregnant?