A bathroom leak can be an emergency, especially if the leak is large, is coming through the ceiling below, comes into contact with electricity or electrical wiring or if it involves sewerage. Apart from being careful and watching out for health and safety, the priority is to fix and find the water leak in your bathroom. If it is bad, and you are able to, it is worth considering switching off your water supply at your stop tap to prevent further water leaking out. If you need to, get help asap.