What Causes Nausea, Sore Throat And Increased Appetite After Having Unprotected Sex?

hi! my boyfriend and i had sex about 2 weeks ago. it was the first time we had it un-protected, but he was only in there for maybe 30 seconds because we didn't want to risk anything, he hadn't cum yet, but he wasn't exactly dry. Now I'm feeling fatigued, tired all the time, more hungry than usual and certain smells are making me nauseous which never happens. the big one that is concerning me is that i have a sore throat and flu like symptoms, which i read is a sign. i really don't know what to think right now and I'm very scared.