Is There A Chance Of Not Contracting HIV After Unprotected Sex?

Hi Doctor. 3 weeks ago, I had a one night stand in which we had unprotected sex twice. She later told me that she is a massage sex worker, but does not often have sex with clients. She said that she was std free, but I cannot confirm that this is true. I never have unprotected sex, so this is not only a rare occasion, but a first time circumstance. I took a hiv rna blood test today, but am stressing over the results that will come in a few days. I know that HIV is a relatively hard disease to catch, but I also know that if she had contracted hiv fairly recently, there is a greater chance of catching it. My question is considering it was vaginal sex, I am a circumcised male, and it was a single night exposure, should I be fairly confident that even if she does have HIV, which she claims not to, I should expect to not have contracted it?