@GSPgirlI had the same thing on a package I tried to track for something I had ordered. It showed that a package with that number had been received in another state a few months before, only this was through UPS. I called the 800 number for UPS and I was told that all the shipping companies reuse the same numbers over again. They would have run out of numbers long ago without using the same numbers after a certain amount of time.
Later, once the people in the shipping area caught up with their work, then my number showed that my package was on it's way to me, in my location. But, now and then, they reuse a number that hasn't been taken out of the system. When that happens, it looks like your package has gone to someone else months before you ordered it. It should work out okay for you. My package got to me just fine, and yours should too.