How much singing of high notes hurts the voice?

This probably sounds really stupid. The lowest I've been able to hit has been a C3, and the highest a D6. Just then I was working on hitting some higher notes and I sung a C7. Since I usually don't sing this high (especially without warmups, I know, bad), will I end up hurting my voice if I continue today?... show more This probably sounds really stupid. The lowest I've been able to hit has been a C3, and the highest a D6. Just then I was working on hitting some higher notes and I sung a C7. Since I usually don't sing this high (especially without warmups, I know, bad), will I end up hurting my voice if I continue today? I'm sorry if this sounds really stupid
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