Do I have a Uti or pregnancy symptoms ?

I had sex unprotected May 6 in 7 days later out of nowhere on May 12 / 13th in so on I started having nausea and my head was hurting in I feel dizzy and when I walk I get light headed & when I pee I feel pressure it don’t hurt but it’s just uncomfortable I don’t feel any weird color discharge or bleeding when I pee my pee is clear in I have to pee every 5-10 minutes but when I do pee, pee does come or I had uti before but I haven’t experienced the nausea