I tested for ALL STI's 2 weeks after possible exposure everything was Negative, but i know that was way to early to detect any antibodies of that night.
Race matters only when it comes to risk assessment of various demographic profiles, BUT NOT INDIVIDUALLY. That is, be the partner white, black, Asian, etc., as long as he/she's HIV negative then you had no chance of contracting HIV from him/her.
No, a risk is a risk.
I can't tell you odds of testing positive or negative. Have you tested at all yet?