From my understanding rice is fine... I was eating left over rice dishes the next day at work and I never found any problems with this what so ever...
The only thing that you should really stay away from is the sushi itself... but as you are having yummmy chicken teriyaki there shouldnt be any problem I would think... and specially if it is a resturant... if it were a little shopping centre take away joint you might want to be worried!!
Good luck and enjoy your lunch!! Once bub comes you wont get many oppurtunities to get out for a relaxing lunch with the girls!

xoxox