Sick Kitty?

When I got home from work tonight, one of my cats had thrown up.  I could not know which one, and that is so frustrating.  Later, after she ate some dry food, Taki threw up.  I am guessing she was the same cat who threw up earlier.  I will just have to observe her and see how she is doing. She is due for her yearly exam next month.  I can move the appointment up if need be.  I hope this was a fluke.