possibly pregnant? HELP

Okay, so I've been feeling nauseous after I eat, I either always need to pee or feel like I need to but can't, and I've been feeling gassy. All of this has been going on for about a week and a half or maybe two weeks. I also had this really weird, nasty taste in my mouth (like morning breath only worse) and it wouldn't go away the entire day, which I read about on only one other post, but I've never heard anyone ever actually talk about it being a symptom they've experienced. My boyfriend and I have had unprotected sex a few times, but he didn't finish. I'm also not on any kind of birth control, we just use condoms. Any advice? I'm worried I might be, being a freshman in college and still living at home and everything.