I had intercourse on june 6 nd i had what i thought was my period on june 8... my period for july hasn't came at all is it possible i am pregnant?

Maybe (not) . . .: If you had unprotected intercourse, than you might be pregnant. Best way to find out, now that you're 4 weeks late, is to do a home pregnancy test, which is available w/o prescription at most pharmacies. As always, use as directed for best results. As an aside, use of condoms each & every time lowers risk for both pregnancy & transmission of sexually transmitted diseases/infections.