So I had sex a week ago and it was on the last day of my period. The sex was protected by condom. I has been feeling nausea for the past couple days. I feel like I'm going to throw up but I don't. And my stomach feels funny like when your really nervous. Something like that. Also I have had on and off uti (urinary tract infection) can that cause it? I'm confused and its to early to take a pregnancy test. I'm so scared.