Question if i messed up my tranny in my 370z

[halogodx]

Hey guys,
I've been on the forum a while but never posted much, but used the advice i learned on the forums. But i got in a situation today that i need some advice.

I was driving down to get some food and I turned into a mall and was driving around 10-15 mph. In my idiotic state of mind while driving i put the car from Drive into Park . I heard a grinding noise , and in a quick second i put it back into drive. I drove around for a while and didn't hear any other noises or anything awkward with the car. Do you guys think i might have messed up something, if so what should i check for or did i get lucky and didnt F anything up...