Last Wed Night I had unprotected vaginal sex with a friend of mine who is 49 and white. It was very brief and only lasted two minutes. I went to test for trich, gono, and chylamdia today 108 hours after my exposure. Right now I have no symtpoms. 

My questions are:

How likely will the test results be accurate?

How high was my risk?

Is only waiting 45-50 minutes before I urinated okay?

If my results are negative, can I continue relations with my regular partner?