You can check the condition of your cambelt by opening the bonnet and looking at the belt. You should find this at the side of your engine. It may be underneath a plastic cover so you may need to lift this up to get a proper look.
When you check your timing belt, look for the following:
Cracks
Missing chunks
Broken or missing teeth
The belt twisting too much when you turn it over
Glossy underside
If your cambelt is showing any of the above, you should book a visual inspection as soon as possible. These indicate that it is coming to the end of its life and may fail soon.