About 4 weeks ago I had unprotected oral sex with a man who is HIV+ (although I didn't know at the time). He went down on me for a minute max but I preformed on him until he reached his climax. I spit everything out immediately, and I had no open sores in my mouth. What are the chances that I've been infected? This was before I got back with my boyfriend and I don't want him to know but since we don't use condoms because we're both tested frequently He'll wonder why I'm using one. Please help me out here.