I assume you are trying to get pregnant?
It's possible, if you had unprotected sex in your fertile window, to get pregnant even if the guy "pulls out." In fact, pulling out does not protect from the chance of pregnancy.
The symptoms you describe sound similar to some early pregnancy symptoms, but you are having them too early if the sex you are thinking got you pregnant was only a week ago. The embryo might not even have implanted yet, and you won't get symptoms until that happens, plus some time has to go by.