In general, STDs such as gonorrhea or chlamydia cause ongoing inflammation of the genital tract, causing the symptoms you learn about of pain, abnormal penile discharge, and pain or burning when you urinate. It is important to speak with your doctor
about this concern. These should persist while you are actively infected, so you would expect more than one episode of discharge. That being said, every person is different any every infection is different, so if you have any kind of abnormal discharge in the context of having unprotected sex that could mean that you have an infection. Having only minimal symptoms does not mean that you are not infected. Given that you had a recent episode of unprotected sex the best course of action is to go see your doctor and get tested for STDs. This can be done very easily with a urine test and does not require any swabbing. If you develop fevers, chills or pain in your sides or back I would go in even sooner. In general, as you know you should always use protection when you have sex - while bacterial infections can be treated, there are growing rates of resistance in the community, and viral infections such as HIV, genital warts
, and herpes can not be eradicated with drugs and will remain with you your entire life. If you have any questions about this, it is also a good topic to discuss with your doctor, who will be happy to give you any further information you need.