[rmjdrift]

no, i let my truck warm up a bit to. I would top it off and then keep an eye on it.

It is a possibility that the motor just needed a bit more coolant and it was sucked out of the overflow tank, this can happen. If this is the case you should be fine after you top it off. If you wanna save some cash, just go get some Distilled water from the store (distilled has no minerals, minerals eat up metal, it what we use in our race cars as well), use the Distilled water to top off the overflow tank and observe it for a few days to see if it goes down.