My first and second flush delivered no gallstones; like you I followed it to the letter but did not see what I was expecting. I did not see diarrhea until mid morning next day - this is most likely due to me being magnesium deficient due to candida, so Epsom Salts might have not saturated my body with enough magnesium to create immediate diarrhea.
I did see dozens of liver flukes so its possible that they might be preventing stones from coming out.

It is important to do colonics before and after Liver Flush to make sure stones are not lodged in the intestines. You might see some come out later in the day or a couple days after if you have sluggish bowel movements.

Good Luck
Mike