What's happening down there..??

I had sex w a condom two days ago, and it felt a little different. I'm on the pill, and we also had sex without a condom but he pulled out. However I got Almost a burning sensation when using the condombut not all the wya there. It can't be an STD because we've both only done this with each other, right? I'm extremely dry and itchy and it's super irritated and swollen and i'm stressing. anyone know what this could be? It doesn't feel very good :(