Still waiting

In June 12th I took my plan B pill I got my period on June 19th....it's August 19th and I still didnt get my period me and my bf had a couple of slips during this period...I think so at least he said he didn't but that's really not what I think..I need help I'm stressing out...I took a pregnancy test on at the end of June and it came up negative...would the test say somthing different if I tested or am I worrying for nothing?