I had unprotected sex and the very next day the right side of my labia towards the top was red and a little sore. It has been two days now and it is still red but it only hurts on my labia, not when I urinate. There are no bumps or anything that I can see that would cause it to burn and it doesn't itch either. I'm wondering if maybe it might be an std or not since the severity of the pain is so miniscule?