Could it be an STD

Patient: Three years ago I had a one time encounter and performed unprotected oral sex on man. He did not ejaculate in my mouth. I have had no symptoms.s of any type of STD, no rashes, no sores, no discharge, nothing. Now, 3yrs later my wife is experiencing bleeding after sex. Could this be an STD from the encounter I had 3yrs ago? She also has PCOS and has very inconsistent periods.