Hello Im Just Going To Ask Why Every Morning When

hello im just going to ask why every morning when i wake up there is a yellow liquid coming out from my penis but no pain..i had a unprotected sex last month and i had a problem with my penis i feel irritation and i ask a doctor what kind of medecine should i take and he give me ciprofloxacin 500mg that i need to take for 10 days and when i finish my medecine the irritation is gone but my problem is why every morning when i wake up there is a yellow liquid coming ot of my penis and there is also a stain on my underwear....hoping that you can answer my problem.