Had similar situation, I would get tested asap just to be sure. I waited for treatmetn and now I am still having problems. Most people say that one night is to fast for any symptoms to develop but if you want peace of mind I would go to the public health office. There are many things you can get from unprotected oral sex in my own experience NGU is very possible. You said slight stinging on the tip, did you mean inside or on the outside? Good luck.
it is where the eye meets the head
If you feel discomfort on the inside tip of your penis then ya. You should definitly be able to tell whether it is inside or out. Remember that this does not mean you have something, I have read that there are a lot of items that can irritate and good example is soap, or certain types of lubrication. If the encounter was with someone you suspect might have an std the best thing to do is to get checked out. Even if you don't have symptoms or they go away you could still have an infection. I know it ***** being in these situations but remember that you are not the first and are definetly the last we have all felt the same way. The hardest thing to do is ask for help but you should, I waited a while and ran into more problems. Also frequent checking of the area can cause irritation, remember I am no doctor and any advice you recieve here is secondary to that of a professional. Many public health docs have inexpensive test and treatments available. I hope everythign works out for you.
So you had sex yesterday? You might be in a different time zone, so I'm not sure how long ago you had the sex.
If it was yesterday, its not an std - you wouldn't get symptoms nearly that fast. It takes at least 2 days minimum, usually longer.
Aj