I really gotta stop doing this to myself.

So I bled lightly for six days, two of those days I spotted. Had a UTI I just got rid of this week. And I've been feeling so nauseous all the time, some foods make me want to puke, my stomach is doing some crazy things feeling tight and random pains in random spots of my stomach, and lower back aches. I just wanna know what are the chances of being pregnant and just not getting a positive test yet? I'd be 5 weeks and 3 days if were pregnant. I'm either getting a stomach bug again or something else is going on.