Just had sex 2 days ago for the first time and i been tired feeling sick haven't been eatting the right way my stomach hurts and im worried

I : I am assuming that you had unprotected sex. Usually it takes at least a week or two to start feeling the first symptoms of pregnancy. It sounds like your symptoms followed fairly immediately after you had intercourse. Pregnancy symptoms can include: lack of a period, nausea, feeling tired and nausea. So, i find it doubtful that these are pregnancy symptoms. With that said, if you miss your period, you should take a pregnancy test.