Creatine is also produced naturally in your body, which is why people think it is generally safe, so I'm not sure how much of a deficit a vegetarian would have compared to vegetarian.
Know that the most common type of creatine is creatine monohydrate, which is a molecule of creatine attached to a molecule of water. Because the creatine is attached to the water, the most initial gains in size that people typically get is caused by water retention (which also means you're going to need to drink additional water throughout the day to prevent damage to your kidneys).
As long as you remember to drink enough water, then it should be safe. Creatine is not a hormone, so it shouldn't mess you up as badly as if you were taking steroids.
Then again, I'm not a doctor, so you probably should ask one of those first.
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