I had sex about 6 days ago. Unprotected. And he might of went in me. Not sure. I all of a sudden have a cold?

I've been coughing and headache always. but also I'm having slight cramping. I want to throw up but it just wont come out. Im also very wet. It's making my underware damp. and I think I might be feverish. Also I have gas really bad to the point it's also making my stomach hurt. Could I tell if I was pregnant already? And are these symptoms?