Sorry honey, but its not just pregnancy you need to worry about.
Firstly, do you seriously not know about pregnancy tests? Telling people your 'symptoms' is not going to get you a diagnosis, not even a doctor can do that for you with a test or examination.
Secondly, if you are so worried, why did you have unprotected sex in the first place? Yes, we all do silly things sometimes, so why didnt you get the morning after pill?
I think you should get yourself clued up on things before you have sex again, assuming you are not already pregnant.