Danni,
First of all, Don’t panic! You gotta remain "calm" while u figure out if you are or not pregnant, our mind is a very powerful "weapon", sometimes it makes u believe that u are feeling all the symptoms u just said but, my advice to you is to go and get a pregnancy test right away, don’t waste any more time, also, try to speak with your boyfriend about it, you gotta let him know cuz in case you really are pregnant, you are gonna need his full support, try not to argue with him, try to have a "nice-and-calm-grown-ups conversation". I don’t know how old you are, but I guess you both aren’t kids, so try to have a chat with him. I hope everything works out the way you want it!! Keep in touch. 🙂
P.S : Please if you’re gonna have sex, do it the safe way, not just because you can be surprised with an unexpected pregnancy, remember there are so many STD out there!! please think about it.