What are the odds of contracting if....?

Here is the story my boyfriend found out this morning that he has . I have been faithful to my boyfriend of almost 3 years but he has cheated and now we are bothing dealing with the consequences. I found a sore on his and asked him about it he said he zipped his up in his zipper. I was kind of weary but I believed him. However I decided to get a pap smear and she said everything looked fine but I didn't have her give me the test because I thought it was routine in a pap smear however it is not so I have another appt. first thing monday morning. Meanwhile while he had the sore I gave oral and had and unfortunately he lied to me. I have no symptoms and I'm 99% sure that I have it because I had while he had a sore but is there a slight chance that I might not have contracted it.