What Causes A White Liquid Like Discharge In The Penis?

Hi, m 26year old male, I had unprotected sex with my gf. After 4-5 days I noticed there was white and smelly milk like liquid coming out of my penis. Even my penis was paining. A day after there was no liquid like that and even the pain was dimnishing, but I am still worried about that thing. I read in the internet that it could be gonorrhea or chlamydia but it was only for once or twice. M going overseas next week. Can I see a doctor over there if it's not a matter to worry yet. Pls guide