Does doubt regarding the emission of semen, or doubt as to whether it is semen, invalidate the prayer?

If a worshiper doubts the emission of something that nullifies ablution during prayer, their prayer is valid because there is no certainty of emission, based on the Prophet's (peace be upon him) saying: "He should not leave (the prayer) until he hears a sound or perceives a smell." However, if one is certain or predominantly believes that a fluid has been emitted, and they are not afflicted with incontinence ( سلس ), then their prayer is invalidated if the emitted fluid is semen ( مني ), pre-seminal fluid ( مذي ), or prostatic fluid ( ودي ).