I had my wisdom tooth extracted yesterday the dentist stitched up the hole it stopped bleeding last night how will I know if it is clotting ok?

Leave it alone! If the bleeding stopped then leave it alone. If you disturb the clot, it will start bleeding again and you will be back where you started. Follow your doctor's instructions and call her/him if you have any further complications.
Faith. If you do not have bad pain, just moderate discomfort then you will be healing correctly. Once the blood clot forms your body will do its job.