I am 21 and was having ovuloc LD for the past 3 months to regularise the cycle. On the 17th day of period, I had unprotected sex(first time), 3days ago. I have taken one femilon pill after 10 hrs of the intercourse. Every night I have been taking the pill, one each night. So, till now I have had 3 pills. Is there a possibility for me to get pregnant? Can it be prevented now?