Do you think i'm pregnant?

i had intercourse last week and now i'm having breast pain, the usual symptom i get days before menstruation... do you think i'm pregnant? my boyfriend didn't *** at all and he thrust only twice or thrice... so do you think i'm pregnant? i'm worried sick! BTW, if i had menstruation last april 6 and started on May 6 again, does that mean i'm regular?