If you didn't have intercourse then you shouldn't be pregnant. You can only get pregnant if a man ejaculates into your vagina. Maybe it's stress/worrying can causing your period to be irregular. Relax and don't worry it will surly show up soon. Take care.
Unless there is sperm in the equation (which can be in pre ejaculation fluids) you cannot get pregnant. As long as his penis didn't enter your vagina there is no need to worry at all.
Stress can cause your period to be late, as well as lots of other unpleasant symptoms. So do your best not to worry.
Also there are several medical things that can make period irregular, you might want to discuss these with your dr just to rule out anything serious that could interfere with future desires for children.
That being said now might be the time to also ask your dr about birth control. This might not only regulate your cycle it will help prevent against future freak out- say if a condom breaks. Since it takes several weeks for it to be effective anyways, before you start having sex might be the best time to get on them. Just remember than no one form of birth control is 100%, so if you want to avoid a pregnancy at all costs- double up; condoms and birth control.