question concerning my flush

Hello everyone.. well Friday night was my first flush, Sat. I did see some stones floating around so I guess it was successful..
Today Sunday my first and second BM there were things floating, they were tan in color. I fished them out they were hard on the outside but broke easily. inside they were also tan, one was round and the other oval shaped and farely large compared to the others the previous days (which were green, I might add) Were these stones? or just DooDoo. Tweet