My take on what you have is power to the ceiling, and a switch loop for power to the fan and light on separate lines. From the switch loop, you want to power an outlet.
If that is right, you do not have enough wires. The switch loop needs a hot, and 2 returns (one for light and one for fan). An outlet can then only be in series with either the fan or light. You will need to run a dedicated wire from the source (ceiling junction box) to the outlet, or run 14-4 as the switch loop.