I just did my first Liver Flush this weekend also, and my results were similar to yours, although I started "going" as soon as I drank the first epsom, and continued to "go" until about 4pm on Saturday. I got maybe 20 raisin size stones, a lot of pinhead sized stones, and a great deal of chaff.
My understanding from reading about the flush and in various forums is that you should wait at least two weeks between flushes.