Is Pregnancy Possible After Having Non Penetrative Sex?

Hi, I fooled around with a friend 6 days ago and he put his penis at the opening of my vagina but I don't think he came. I think I was the one who was wet. Is it possible that I'm pregnant given that I'm tired, has back pain, feeling constipated and urinating frequently? please answer! I don't know if I'm pregnant or just paranoid?