They don't know exactly why it happens. They know the mechanics of it, as far as it means that the ovaries aren't responding well enough to the stimulation... but they don't know WHY they aren't responding enough. They did before on the same dosage... So, not sure what's changed. She said that the body can react differently every cycle. I guess its "just one of those things." I've read some stories where cycles were salvaged doing what I'm doing... and others where they weren't. We're trying to be realistic about it, but not give up entirely just yet. Since the drop was so minor, maybe its not a total wash yet. I don't know. I'm expecting the worst, but always hoping for the best. I think I'm going to post a thread to see if anyone else has ever had this happen to them and how it turned out. I need more input...