Vomitting on just water?

I got sick today on just water. I hadn't eaten for 1 hour and 20 minutes, drank about an ounce of water, and immediately felt yucky. 20 minutes later, all the water came up. I haven't had any problems with food, but am wondering whether or not to be concerned. I have thrown up about 3 or 4 times this month as opposed to only 1x each of June and July. When do I become concerned enough to call the doctor?

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