Is my package sent?My tracking number is EE992343627CN

I've been waiting for my package for a while now, and I asked my seller for a tracking number. I received it last week but when I tried tracking it on the ems website, the site keeps saying "No tracking information for the shipment, or overdue tracking." I've read that EMS sometimes does this.

My question is: Since I've received a tracking number, does that mean my package is already sent and on the way? Because tracking numbers are only received once a package is registered at the office, right?

Thank you for your help.