You can narrow down where the leak is even more by doing the following. Fill the pool to its normal level and mark it with a piece of tape or Sharpie. Next with your filter system running the whole time, wait 12 to 24 hours and measure the loss of water.
Then refill the pool back to the same level and with the filter system off, wait the same amount of time, ideally also over the same part of the day and measure the water loss.
If you are losing more water with the filter system running, the leak is on the pressure side of your plumbing somewhere PAST the impeller of the pump. If you are losing less water with the filter system not running, the leak is on the vacuum side of your plumbing somewhere BEFORE the impeller of the pump.
Note : if the water loss is the same, then your leak is in the structure of the pool and not in the plumbing. Time to call Leak Detectives!