I would go and see your gp, firstly for a pregnancy test and secondly to establish if you have caught an STI. You say you don't think you're scared and I don't know what you mean. Are you scared or not? Did you plan to fall pregnant?
It does sound like you could be pregnant, but they could also be period symptoms, and your period may be late if you are stressing about being pregnant!
If you can give us a little more detail I am sure more people will try to help x