Hi. I fully understand your concern here.
Any other symptoms like fever, rash, swollen lymph nodes, burning on urination, penile discharge?
Please stay away from Dr Google James--that can scare the bejesus out of you. It's simply way to early for you to be getting any HIV symptoms and you really don't have the right symptoms anyway. I think you don't have any STD and the chances of getting any of them with a one-time episode are very, very low.
Try not to worry but do get the screenings in three months.
If you don't have any more need for any more information, let me know how it goes and please remember to rate my service to you.