Transmission of STDs

Patient: I received unprotected oral sex from a prostitute around 3 weeks ago. My only physical symptom so far is bladder pain and a feeling of needing to urinate frequently.24 hours after this contact, i had unprotected sexual intercourse with a friend who was known to have no std’s.if i did contract something from the first partner, what is the likelihood of me having passed this on to my second partner, providing it was a small timeframe between contacts?