What is the ruling on prayer if a small amount of fluid is discharged after its completion, and is it obligatory to repeat it, and what is the ruling if the fluid is abundant?

Whoever prays and then doubts the emission of something from them after completing the prayer, their prayer is valid and does not need to be repeated. This is because doubt after finishing an act of worship does not affect it, unless one becomes certain that something was emitted before the prayer concluded, in which case it becomes void.