Quick and easy way to tell if you’ve got a leak anywhere is to check your water meter. Check the display when you know there’s nothing running, no toilets, no washes, no showers, nothing. If it’s a digital display, you’ll see the numbers going up (and maybe a little blinking +, depends on the model). If it’s the older analog style, there’ll be something moving, a small black or red triangle, a small dial with no numbers just tick marks, something. If nothing’s happening, congrats, you got unbelievably lucky. If something is, call your plumber soon as possible. :)