I and my girlfriend had a protected sex 2 days after her regular periods. She took ipill just within 2 hours. Today its 12 days since she missed her regular period date. We took urine pregnancy test on 5 and 11 day of missed periods and it came negative. Is there any chance of pregnancy. Should we consider taking withdrawal meds like "Primolut N" To avoid any chance of pregnancy and get periods back. Please suggest something