I Found A Small Cyst-like Thing In My Feces. It

I found a small cyst-like thing in my feces. It appeared to be hollow. It was round. I'm wondering if it could be a carbamazepine pill where the coating made it all the way thru the digestive tract, while the insides dissolved out. The object was more or less the same size & color of my current Rx. Sorry this is sort of gross.