You can overpump a well and get fine sediments into the system. Commonly, the below-ground reservoir recharges from adjacent water in the formation. Might have to let the system flush for a bit, after the well "catches up".
It's possible that the over-pumping caused some sort of partial collapse in the underground formation, stirring up fine sediments. These should settle out in a relatively short time.
run the pump and fill a container. Filter a gallon or so through a coffee filter, and see what sort of sediment you have...
Art