Is Pregnancy Possible While On Eramac To Regulate Periods?

i had sex on 4 feb night. n i took unwanted 72 on vry next day 5 feb. i again took an another pill on 6 feb noon. it is been 7 days as to day is 11 feb. i havn't bleed yet and don't have any kind of abdominal pain. 4 feb was my 20th day of menstural cycle n likely to start my periods on 14th feb. i regularly take Eramac tablets to regulate my menses. us there any chances of pregnancy.?? i m very much stressd. please help me out.