Once you receive a shipment tracking notification, sometime you'll see the shipping label has been created but no further status.  Rest assured that your package is usually handed off to the mail carriers such as USPS the same day or next day depending on mail carrier availability.
There are times when the mail carrier is slow in providing shipment tracking status updates.  Unfortunately there is nothing can be done about that, and it may seem the package has not been shipped or stuck somewhere.  It's tough, but please have patience.