Condom broke, Planned B...pregnant?

Hey everyone, A week from today last monday I had unprotected with my childs father, who is now 5 months and the condom broke. My LMP started on Octomber 10th or 11th one of the two so I don't know if I was ovulating around that time or not that I had . that following wednesday I went to walgreens and got planned B and took it that same day. It is now monday and I have not recieved my period yet. I have tooken planned B two times before so I know how its works. With me personally, 4 days after I take it, I always receive my period like clockwork so I should have recieved it on saturday but I did not. Today I started having tenderness and lower stomach cramping could I be pregnant?