After having unprotected sex, i've been having pain while urinating, could this be simply a infection or a std? is the only way to know, waiting?

See below: Burning with urination (aka dysuria) suggests either infection (UTI or STD) or inflammation (e.g. Non-bacterial prostatitis). Post-sex simple UTI/bladder infection quite common in females but not in males and would be concerned about possible STD (chlamydia, GC) especially if discharge from penis or just prostate inflammation. Would recommend urinalysis, urine culture, and urine for GC/Chlamydia.