Could i be pregnant? help please very scared?

ok i am on the pill..microgynon 30 and i have been taking it for over a year now..this month i havent missed any days of taking the pill. I had unprotected about 2 weeks before my period was due..then during the 7 day break of the pill i had unprotected again..both times my bf pulled out before he came (yes i know a really stupid thing to do) i usually come on my period on the saturday morning during the 7 day break and finnish on the tuesday without fail but now its sunday and i havent started yet..could i be pregnant or is it just late or missed this month ??? what should i do??