ECN Forum Forums General Topics of the Trade General Discussion Area wire capacity of 1/2 inch conduit

i have a 1/2 inch conduit that runs from my panel to the far side of my house and supplies 2 rooms, a hallway and a garage.
currently this pipe contains three 15 amp circuits and a 20 amp circuit. these are multiwire circuits. there are 4 14 gague wires and 2 12 gauge wires.

could i add an additonal 2 amp circuit? to do this i would need to pull an additonal 12 gauge wire and a 14 gague neutral.

then i would have 4 15 amp circuits and 2 20 amp circuits.

simply put, the pipe would contain 6-14 AWG (4 current carrying) and 3 12 AWG (2 current carrying) would this be ok, or would the pipe be over stuffed?