About 12 days ago I had a sexual encounter with a bisexual man. I'm a gay man and am not very sexual active (I just got out of a ltr monogamous). Anyways, I ended up meeting this bisexual man on myspace and we decided to meet up...things escalated and we ended up making out and I performed oral sex on him. I asked him before we met up if he had gotten tested, and he said, "yes, in August" and that he was HIV negative. I also made sure before things escalated to ask him again that he was HIV negative, and he said that he was negative and asked me my status, I said negative (tested in Dec). There was no ejaculation, but there was precum when I was going down on him. The next morning I noticed that I had a very minor burn on my tongue and that it was even bleeding a little bit (I'm guessing it was bleeding because my mouth gets very dry overnight). I vaguely remembered burning my tongue the day before, but nothing crazy, or nothing that really hurt, I had even forgotten about it.
Anyways, 12 days later, I've noticed a swollen something right behind my ear lobe. I'm guessing it's a lymph node, but I'm not sure. It's bout the size of a pea. I want to say that I've gotten swollen in this area before, but I'm not 100% sure. I've contacted the guy and he has assured me that he is HIV negative, was tested in August, and has only been having safe sex. Do you think I'm at risk?