If you were to use the P/s fluid like that all the time it would likely shorten the life of your catalytic converter but this "one time" happening shouldn't hurt anything. It will dilute out as you fill the tank a few more time. If your still concerned, fill up again after you're down by a 1/4 tank and repeat 3 or 4 times. That will dilute it faster.
Used to do that with ATF for a bit of a top lube for the valves and rings before cats were installed on cars.
JD