Stay calm. Most clogs clear with patience.
If you have a shop vac, set it to liquids, seal the hose around the drain, and suck the clog out. how to unblock a loo without a plunger
Straighten a metal hanger, leaving a small hook at one end. Wrap the tip with tape to avoid scratching porcelain. Gently work it down the drain to break up or pull out the clog. Stay calm