Two days ago I had protected sex with this girl. But during foreplay we were rubbing genitals together and at a certain point i stuck my penis on her vagina through my underwear. But at that point she had no underwear on. As far as I know my penis did not touch her vagina but im not 100%. I dont know maybe my penis slipped though the opening of my boxers and touched her vagina which is why im paranoid. What are the chances that I have gotten a STD. Any help would be greatly appreciated.