Does vaginal discharge increase or decrease before period ? please answer in detail what exactly happens. thankyou

Remains same: The amount of discharge doesn't change, but the consistency is thick. If you are trying to determine if you might be pregnant, discharge isn't the best marker. If you're worried, take a pregnancy test, as that's the best marker. Discharge changes mid-cycle when it becomes thin and watery. At other ends of the cycle it is thicker.