I am a gay and perform oral sex on a young man yesterday, who i don't know well. I get his pre-cums and he ejaculated in my mouth but I spit immediately. There is no cuts on his penis and in my mouth. Besides, he told me all the time that he was healthy. But now, I feel really anxious whether I will get hiv. Although I have red many other questions and tell me to be calm, I just cannot stop being worried. I really need some suggestions.