What Are The Chances Of Pregnancy With Delayed Periods?

Hello, My girlfriend is late on her period in which she was suppose to have it around first week of november. I worried she might be pregnant but we have broken up and its been hard on her. We had unprotected sex twice at the beginnging of oct i cant remeber exactly when. She also has stopped taking her birth control midway through october since we broke up? do you think she pregant?