What Causes Burning Sensation In Labia Minora After Intercourse?

The other day me and my fiancée wanted to try having sex for hours straight. Now my labia minora burns very bad. I just looked in the mirror at it and the tips have turned a yellow color. If I touch it even a little it starts burning. We didn't use any condoms the whole time so my body ran out of lubrication. Is something wrong with me?