Morning after pill

I was supposed to start my period on June 26th, but had sex two days before..condom broke, took morning after pill the morning after. I still haven't started my period, and it's almost the 30th. I'm extremely stressed right now because of summer classes and well the obvious. Should I have major concern about possibly being pregnant? Or do y'all think me being late is more than likely do to stress and by taking the morning after pill?