Menstrual problem

Patient: Hello Sir Madam,Me and my boy friend had sex two and a half months ago with out any protection. Last month I had my menstrual cycle (Periods) a bit late of approximately 3 days. But this month, eventhough its already 10 days late, I didnt get my menstrual(Periods). Is it possible to get pregnant in this case?(Like after having sex, got one menstrual cycle).Please help me.Waiting for you reply.Thank you.SD