Found a pill on my floor, it is round and flat, and the ONLY identifying mark is the letter “C” on one side, and the other side just has a score mark... couldn’t find it anywhere on the pill identifier, and it definitely isn’t anything that anyone here takes. I live in the US, I’m kind of nervous about taking it to a pharmacist in case it’s something illegal for me to have, like controlled substances. Any input would be appreciated!