What can be indicated by burning after urination?

Hello. Over a week ago, I started taking antibiotics for an upper respiratory tract infection. After a few days I had the impression that ringworm was beginning to develop in me, so I prophylactically used gynoxin uno. After 3 days of application I had intercourse and since then (about 4 days) I feel a burning sensation after urination, especially in the morning. I have no other symptoms, neither related to fungal infection nor cystitis. Is it just a mucosal irritation that will pass by itself, or should I see a doctor?