Tips to detect leaks to determine if your foundation/slab is leaking:
Water coming out from underneath your house would be a sign of a possible slab leak. Unless you have a good reason for this to be happening (unlikely). You may also see water leaking out of the pipes on the outside of your home or from the cracks between the bricks or in your foundation.
Also consider if there is water coming from inside your house. For example, cabinets, floors and tile often have water leaking out from them.
Getting a slab leak in your home is, unfortunately, a big deal! So, you need to get a certified plumber out to your house as soon as possible. The longer the slab leak runs, the more damage it can do to your house. Water takes down mountains. It can certainly destroy your house.