4th flush, zero stones

Hey guys. Well I did my 4th flush 3 days ago and still not one stone. I did mess up and accidentally fall asleep and I woke up in the middle of the night and took my OO/GFJ mixture 3 hours later than I was supposed to. I don't really see why this would completely stop me from passing any stones though. I haven't had any pain at all, just no stones. But, I had a small gallstone attack the morning before my flush so that means that I still have stones right? I guess I will just try again next week and see how it goes. Does anyone think that maybe I just don't have any stones anymore? Why wouldn't I pass any stones? Thanks for your help.

Val