What Causes Irritation In The Vagina After Unprotected Intercourse?

Hi. My boyfriend and I had unprotected sex 2 weeks ago. He was being a tease and didn't stay in me for more than 30 seconds. But after he pulled out, my pee hole became irritated and itchy. It's been like that since then. This irritation makes me want to use the bathroom more frequently even though it's a very little. it's Is it std or fungus? Should I worry?