Itching and Discomfort

My boyfriend and I had sex (using the same condoms we always use) last Thursday/Friday and ever since then the entrance surrounding my vagina as been itchy and sensitive. There's no oddly looking discharge or foul smell scent, so I eliminated an yeast infection, but it's really uncomfortable and fairly annoying. I don't want to believe it to be an STD because we always use condoms. I'm not sure if I should contact my doctor to see what's wrong or if there is an over the counter remedy?