Giving head and hiv

So I gave this guy head and there was a rumour going around that he had hiv. I don't remember having any open cuts or anything on my mouth. And a girl I know had sex with him and then got tested for a few thing including hiv and it came back negative. They had protected sex. I had unprotected oral with him ( I gave him head). Am I at risk for getting it if you even has it?