I was drilling into my wall in my laundry closet (contains my washer, dryer, and water heater) to install shelf brackets above my dryer and washer. After using a stud finder, I drilled where I thought a wall stud was above my washer, but it seemed that after drilling through the drywall part, the drill hit something solid. I gave the drill some hard pushes, thinking it was hitting the stud, but the drill did not go any further. I tried drilling in another spot around the same area and encountered the same thing.
I'm now worried that I hit a pipe of some sort. It does not seem to be a water pipe at least, since there are no water leaks, so I am worried that I hit a gas pipe. Would it be noticeable if I hit a gas pipe? (I don't smell anything, so am reluctant to call the gas company if I'm just being overly paranoid). Is there anything else I should be concerned about, and, if so, how would I diagnose it?