If you suspect a burst pipe under your slab, watch for signs such as a sudden decrease in water pressure, unexplained water pooling around your home's perimeter, or noticeable cracks in your walls or baseboards. You may also hear the sound of running water when no faucets are in use. If you notice any of these signs, it's essential to seek professional assistance promptly to assess and address the situation, as burst pipes can lead to significant damage if left unattended.