Am I a vegetarian now?

Something just hit me, I think I could possibly be a vegetarian now.

For the last two weeks, I have only consumed fruit, vegetables, some dairy products, and maybe a touch of fish.

Assuming I keep this routine, would I now be considered a vegetarian by some? even with the occasional tuna on my salad?

Does there have to be some kind of decision for it to count so to speak? or can being a vegetarian just creep up on you like that?