So embarrassing but I need help!

Ok so I was having sex with my husband and he cut me on accident like not in the inside but on the out side of my vigina opening.. Um im so damn scared I don't know if I should go to the doc or let it heal.. What do you think I should do. And if I should let it heal. What should I do to take care of the cut?? I'm really scared I don't want an infection down there. Please help me!