Hi doc, Im new to using contraceptive pills, and Im taking althea last feb 28 , I have sexual contact with my fiance the same day . I start taking it not on my first day of menstruation and im on the 18th tablet now out of 21 tablet. My last month menstruation was Feb 8 and today is March 16 already, I didn't have my menstruation yet. Im kind of worried. Is there any possibilities that Im pregnant ?