Period is two weeks late!!?

I've been having a regular cycle for seven years now. My period is never late, usually it will only be a few days late. I have been having sex with my boyfriend regularly, using condoms which have never broken but he has came in the bed where i sleep naked? or if he gets cum on his hand then touches me? I normally dont worry about these things but I can't get it out of my mind. I'm 18 and I am not on birth control. please help, I don't know what to do!