Best advice I can give is not to fret, its highly likely the bag will turn up.

There is little point phoning anyone (may make you feel better to start with but would ultimately just get you more worried and frustrated) as they will not have a lot of info to give you.

The worldtracer app is not very informative.

make sure you have a mobile number set up correctly in worldtracer and it will send you an SMS whenever there is some news.

My most recent experience, no bag arrives on a Friday evening

txt late Saturday afternoon telling me the bag has been located and will be on a flight arriving 20:20

no further txt that evening

txt in the morning that the bag has arrived at the local airport and would be given to the courier at mid day

There was then an update on world tracer (but no sms) saying expected deliver time would be 13:30. Bag arrived around 13:20