I had a sexual encounter with someone else than my wife 4 weeks ago. I received oral sex for a few minutes and there was a brief 20 seconds vaginal penetration before we stopped. Obviously, i feel horrible about this. I have no symptoms and i have asked the lady i had the encounter with and she also does not have any symptoms. She is also married. My wife just developed a vaginal itch which she believes that is due to zythromax prescription following another illness. I am very worried. Should i get tested?