Could I catch hiv from drinking after someone? I had a party with some friends. A friend of mine brought their roommate, and after a couple drinks of my own, the roommate and I found we had much in common. I offered to make this person a mixed drink. Ingredients including a liquor I did not like. After drinks of my own i?m unsure if I drank from the same cup as the roommate or not. I do remember looking into the cup and not seeing anything suspicious though. Later that night the roommate was showing my his tinder, his profile said ?hiv positive, undetectable? and then asked if I was worried. I did?t want to be mean so I said no. But I am scared because my wisdom tooth is coming in. And with sore gums I want to know is it possible to contract hiv from drinking after someone.